19733572174975117888
19,733,572,174,975,117,888 is an even composite number composed of nine prime numbers multiplied together.
What does the number 19733572174975117888 look like?
This visualization shows the relationship between its 9 prime factors (large circles) and 1792 divisors.
19733572174975117888 is an even composite number. It is composed of nine distinct prime numbers multiplied together. It has a total of one thousand, seven hundred ninety-two divisors.
Prime factorization of 19733572174975117888:
26 × 11 × 13 × 17 × 37 × 61 × 1093 × 6277 × 8191
(2 × 2 × 2 × 2 × 2 × 2 × 11 × 13 × 17 × 37 × 61 × 1093 × 6277 × 8191)See below for interesting mathematical facts about the number 19733572174975117888 from the Numbermatics database.
Names of 19733572174975117888
- Cardinal: 19733572174975117888 can be written as Nineteen quintillion, seven hundred thirty-three quadrillion, five hundred seventy-two trillion, one hundred seventy-four billion, nine hundred seventy-five million, one hundred seventeen thousand, eight hundred eighty-eight.
Scientific notation
- Scientific notation: 1.9733572174975117888 × 1019
Factors of 19733572174975117888
Divisors of 19733572174975117888
- Number of divisors d(n): 1792
-
Complete list of divisors:
1 2 4 8 11 13 16 17 22 26 32 34 37 44 52 61 64 68 74 88 104 122 136 143 148 176 187 208 221 244 272 286 296 352 374 407 416 442 481 488 544 572 592 629 671 704 748 793 814 832 884 962 976 1037 1088 1093 1144 1184 1258 1342 1496 1586 1628 1768 1924 1952 2074 2186 2257 2288 2368 2431 2516 2684 2992 3172 3256 3536 3848 3904 4148 4372 4514 4576 4862 5032 5291 5368 5984 6277 6344 6512 6919 7072 7696 8177 8191 8296 8723 8744 9028 9152 9724 10064 10582 10736 11407 11968 12023 12554 12688 13024 13481 13838 14144 14209 15392 16354 16382 16592 17446 17488 18056 18581 19448 20128 21164 21472 22814 24046 24827 25108 25376 26048 26962 27676 28418 29341 30784 32708 32764 33184 34892 34976 36112 37162 38369 38896 40256 40441 42328 42944 45628 48092 49654 50216 50752 53924 55352 56836 58682 65416 65528 66368 66673 69047 69784 69952 72224 74324 76738 77792 80882 81601 84656 89947 90101 91256 96184 99308 100432 106483 106709 107848 110704 113672 117364 130832 131056 133346 138094 139247 139568 144448 148291 148648 153476 155584 156299 161764 163202 169312 179894 180202 182512 192368 198616 200864 204391 212966 213418 215696 221408 227344 232249 234728 241553 261664 262112 266692 276188 278494 279136 296582 297296 303067 306952 312598 322751 323528 326404 338624 359788 360404 365024 382897 384736 397232 401728 408782 422059 425932 426836 431392 442816 444851 454688 464498 469456 483106 498797 499651 523328 524224 525733 533384 552376 556988 558272 593164 594592 606134 613904 625196 645502 647056 652808 687497 719576 720808 730048 733403 765794 769472 794464 817564 844118 851864 853672 862784 866749 889702 897611 909376 928996 938912 966212 997594 999302 1051466 1066768 1104752 1113976 1133441 1171313 1173799 1186328 1189184 1212268 1227808 1250392 1291004 1294112 1305616 1374994 1387217 1439152 1441616 1466806 1531588 1531717 1588928 1635128 1688236 1703728 1707344 1733498 1779404 1795222 1810211 1857992 1877824 1932424 1995188 1998604 2102932 2133536 2209504 2227952 2266882 2342626 2347598 2372656 2424536 2455616 2466901 2500784 2554739 2582008 2588224 2611232 2657083 2749988 2774434 2878304 2883232 2933612 3019237 3063176 3063434 3270256 3333737 3376472 3407456 3414688 3466996 3558808 3590444 3620422 3715984 3864848 3939871 3948233 3990376 3997208 4205864 4211867 4267072 4419008 4455904 4533764 4685252 4695196 4745312 4849072 4933802 4977661 5001568 5109478 5152139 5164016 5222464 5314166 5486767 5496161 5499976 5548868 5756608 5766464 5783063 5867224 6038474 6126352 6126868 6495463 6509249 6540512 6667474 6752944 6814912 6829376 6860761 6933992 7117616 7180888 7240844 7431968 7562467 7729696 7879742 7896466 7980752 7994416 8411728 8423734 8494067 8911808 8937461 8952763 9067528 9370504 9390392 9490624 9534239 9698144 9867604 9955322 10003136 10218956 10304278 10328032 10628332 10973534 10992322 10999952 11097736 11566126 11734448 12076948 12252704 12253736 12467851 12990926 13018498 13081024 13334948 13505888 13721522 13867984 14167189 14235232 14361776 14481688 14734733 14863936 15124934 15259387 15459392 15759484 15792932 15961504 15988832 16823456 16847468 16988134 17874922 17905526 18135056 18487087 18741008 18780784 19068478 19396288 19735208 19910644 19912321 20437912 20608556 20656064 21256664 21947068 21984644 21999904 22195472 23132252 23468896 24153896 24505408 24507472 24935702 25981852 26036996 26669896 27011776 27135911 27443044 27735968 28334378 28470464 28723552 28963376 29469466 30249868 30518774 31518968 31585864 31923008 31977664 32069713 33211607 33646912 33694936 33976268 35749844 35811052 36270112 36974174 37482016 37561568 38136956 39470416 39821288 39824642 40875824 41217112 41937317 42513328 43338581 43430563 43894136 43969288 43999808 44390944 46264504 46937792 48307792 49014944 49871404 51327029 51414907 51963704 52073992 53339792 54271822 54754271 54886088 55471936 56668756 56673529 57447104 57926752 58938932 60499736 61037548 63037936 63171728 64139426 66423214 66977807 67389872 67952536 71450093 71499688 71601739 71622104 72540224 73948348 74964032 75123136 75468371 76273912 78940832 79642576 79649284 81751648 82434224 83874634 84620237 85026656 86677162 86861126 87788272 87938576 88781888 89189893 92529008 93434737 96615584 98029888 98312071 98480393 99742808 102654058 102829814 103927408 104147984 106679584 108543644 109508542 109772176 110422871 113337512 113347058 115853504 116385919 116632937 117877864 120999472 122075096 126075872 126343456 128278852 132846428 133955614 134779744 135905072 142900186 142999376 143203478 143244208 147896696 150936742 152196971 152547824 155839079 157881664 159285152 159298568 162082063 163503296 164868448 167749268 169240474 170053312 173354324 173722252 175576544 175877152 178379786 184173457 185058016 186869474 193231168 196624142 196960786 199485616 203357957 205308116 205659628 207854816 208295968 213359168 217087288 219017084 219544352 220845742 226675024 226694116 232771838 233265874 235755728 240332131 240842213 241998944 244150192 252151744 252686912 253848157 256557704 265692856 267911228 269559488 271810144 285800372 285998752 286406956 286488416 295793392 301873484 304393942 305095648 311678158 314280479 318570304 318597136 324164126 329736896 331252231 335498536 338480948 346708648 347444504 351153088 351754304 352766843 356759572 368346914 370116032 373738948 393248284 393921572 398971232 406715914 410616232 411319256 415709632 416591936 418506421 434174576 438034168 439088704 441691484 453350048 453388232 461310487 465543676 466531748 471511456 480664262 481684426 483997888 488300384 507696314 513115408 531385712 535822456 543620288 545185121 546118543 564597319 565563977 571600744 571997504 572813912 572976832 591586784 603746968 608787884 610191296 623356316 628560958 637194272 648328252 662504462 668393791 670997072 676961896 693417296 694889008 705533686 713519144 736693828 736755877 747477896 786496568 787843144 797942464 813431828 821232464 822638512 837012842 868349152 874053419 876068336 883382968 906700096 906776464 922620974 930822607 931087352 933063496 943022912 961328524 963368852 976600768 981088823 1015392628 1026230816 1062771424 1071644912 1090370242 1092237086 1129194638 1131127954 1143201488 1145627824 1183173568 1207493936 1214651581 1217575768 1246712632 1257121916 1274388544 1280245109 1282962307 1296656504 1325008924 1336787582 1341994144 1353923792 1386834592 1389778016 1411067372 1427038288 1473387656 1473511754 1494955792 1516228181 1572993136 1575686288 1626863656 1642464928 1645277024 1674025684 1674166681 1736698304 1748106838 1752136672 1766765936 1813552928 1845241948 1861645214 1862174704 1866126992 1902351559 1922657048 1926737704 1962177646 1978560623 2025908027 2030785256 2052461632 2125542848 2143289824 2180740484 2184474172 2258389276 2262255908 2286402976 2291255648 2414987872 2429303162 2435151536 2493425264 2514243832 2560490218 2565924614 2593313008 2643653441 2649264343 2650017848 2673575164 2683988288 2707847584 2773669184 2779556032 2792329727 2822134744 2854076576 2946775312 2947023508 2989911584 3032456362 3130948769 3136309327 3145986272 3151372576 3253727312 3284929856 3290554048 3300026041 3348051368 3348333362 3457085269 3496213676 3504273344 3533531872 3627105856 3643774541 3690483896 3723290428 3724349408 3732253984 3804703118 3845314096 3853475408 3924355292 3957121246 4051816054 4061570512 4085646227 4286579648 4306279003 4315418669 4361480968 4368948344 4516778552 4524511816 4572805952 4582511296 4603570631 4829975744 4858606324 4870303072 4986850528 5028487664 5120980436 5131849228 5186626016 5287306882 5298528686 5300035696 5347150328 5415695168 5440583473 5584659454 5631287927 5644269488 5708153152 5893550624 5894047016 5979823168 5997036331 6007303973 6064912724 6261897538 6272618654 6291972544 6302745152 6507454624 6600052082 6696102736 6696666724 6914170538 6992427352 7067063744 7099541059 7114609157 7287549082 7352331701 7380967792 7446580856 7448698816 7464507968 7609406236 7690628192 7706950816 7848710584 7914242492 8103632108 8123141024 8171292454 8612558006 8630837338 8722961936 8737896688 9033557104 9049023632 9207141262 9284015231 9614587609 9717212648 9740606144 9973701056 10056975328 10241960872 10263698456 10373252032 10574613764 10597057372 10600071392 10694300656 10881166946 11169318908 11262575854 11288538976 11362694447 11787101248 11788094032 11994072662 12014607946 12129825448 12523795076 12545237308 13014909248 13200104164 13392205472 13393333448 13828341076 13984854704 14199082118 14229218314 14575098164 14704663402 14761935584 14893161712 15218812472 15381256384 15413901632 15484737577 15697421168 15828484984 16207264216 16246282048 16342584908 16678509991 17225116012 17261674676 17445923872 17475793376 18067114208 18098047264 18414282524 18568030462 19229175218 19434425296 20113950656 20206386091 20483921744 20527396912 20925867149 21149227528 21194114744 21200142784 21388601312 21762333892 21764166853 22338637816 22525151708 22577077952 22725388894 23576188064 23988145324 24029215892 24259650896 24730570267 25047590152 25090474616 26400208328 26784410944 26786666896 27656682152 27969709408 28398164236 28458436628 29150196328 29409326804 29523871168 29786323424 30437624944 30969475154 31394842336 31656969968 32339976503 32414528432 32685169816 33357019982 34440436459 34450232024 34499402597 34523349352 34891847744 34951586752 36134228416 36196094528 36300286451 36828565048 37136060924 38458350436 38868850592 40412772182 40772021251 40967843488 41054793824 41851734298 42298455056 42388229488 42777202624 43524667784 43528333706 44677275632 44942108497 45050303416 45450777788 47152376128 47369069033 47469605359 47976290648 48058431784 48519301792 49461140534 50095180304 50180949232 52800416656 53317258559 53573333792 55313364304 55939418816 56100442697 56196493351 56796328472 56916873256 58300392656 58818653608 59572646848 59846418203 60875249888 61938950308 61944167197 62789684672 63313939936 64679953006 64829056864 65370339632 66714039964 68880872918 68900464048 68998805194 69046698704 72600572902 73206743051 73657130096 74272121848 76916700872 77737701184 78094951649 78260700727 80825544364 81544042502 81935686976 82109587648 83703468596 84596910112 84776458976 87049335568 87056667412 89354551264 89884216994 90100606832 90901555576 92489919041 94738138066 94939210718 95952581296 96116863568 97038603584 98922281068 100190360608 100361898464 102124167541 105600833312 106634517118 107146667584 110626728608 112200885394 112392986702 113592656944 113833746512 116043445099 116600785312 117637307216 119692836406 120692198003 121750499776 123877900616 123888334394 124989638917 126627879872 129359906012 129658113728 130740679264 133428079928 137761745836 137800928096 137997610388 138093397408 145201145804 146413486102 147314260192 148544243696 153833401744 156189903298 156521401454 161651088728 163088085004 167406937192 169193820224 169552917952 170332113347 174098671136 174113334824 178709102528 179768433988 180201213664 181803111152 184979838082 189476276132 189878421436 191905162592 192233727136 197844562136 200380721216 200723796928 201301588501 204248335082 211201666624 213269034236 221253457216 222270247001 224401770788 224785973404 227185313888 227667493024 232086890198 233201570624 235274614432 239385672812 241384396006 247755801232 247776668788 249979277834 258719812024 261481358528 262683019183 263240538809 266856159856 272036272937 275523491672 275601856192 275995220776 276186794816 290402291608 292826972204 294628520384 297088487392 307666803488 312379806596 313042802908 323302177456 326176170008 334813874384 340664226694 343508563547 348197342272 348226669648 355739741533 359536867976 360402427328 363606222304 369959676164 378952552264 379756842872 383810325184 384467454272 395689124272 402603177002 408496670164 420419694539 426538068472 444540494002 448492233761 448803541576 449571946808 454370627776 455334986048 464173780396 470549228864 478771345624 482768792012 495511602464 495553337576 499958555668 517439624048 525366038366 526481077618 533712319712 544072545874 551046983344 551990441552 580804583216 585653944408 586489844149 594176974784 615333606976 617104869667 618161426861 624759613192 626085605816 646604354912 652352340016 669627748768 681328453388 687017127094 693124361267 696453339296 711479483066 719073735952 727212444608 730554413563 739919352328 757905104528 759513685744 791378248544 805206354004 805274173561 816993340328 840839389078 853076136944 889080988004 896984467522 897607083152 899143893616 928347560792 955340386967 957542691248 965537584024 991023204928 991106675152 999917111336 1017389109451 1034879248096 1050732076732 1052962155236 1067424639424 1088145091748 1102093966688 1103980883104 1161609166432 1171307888816 1172979688298 1234209739334 1236322853722 1249519226384 1252171211632 1276477896089 1293208709824 1304704680032 1327614178033 1339255497536 1362656906776 1374034254188 1386248722534 1392906678592 1422958966132 1438147471904 1461108827126 1479838704656 1508564786287 1515810209056 1519027371488 1582756497088 1610412708008 1610548347122 1633986680656 1681678778156 1706152273888 1778161976008 1793968935044 1795214166304 1798287787232 1856695121584 1910680773934 1915085382496 1931075168048 1972738566683 1982213350304 1999834222672 2034778218902 2069758496192 2079270253987 2101464153464 2105924310472 2176290183496 2204187933376 2207961766208 2214317473511 2323218332864 2342615777632 2345959376596 2468419478668 2472645707444 2499038452768 2504342423264 2552955792178 2609409360064 2655228356066 2725313813552 2748068508376 2772497445068 2845917932264 2876294943808 2889513211013 2895645926899 2922217654252 2959677409312 3017129572574 3031620418112 3038054742976 3220825416016 3221096694244 3267973361312 3363357556312 3412304547776 3422127004517 3427986094411 3556323952016 3587937870088 3590428332608 3596575574464 3713390243168 3778594199017 3821361547868 3830170764992 3862150336096 3945477133366 3964426700608 3999668445344 4069556437804 4158540507974 4202928306928 4211848620944 4352580366992 4428634947022 4465611326111 4624616639929 4685231555264 4691918753192 4936838957336 4945291414888 4998076905536 5008684846528 5105911584356 5310456712132 5450627627104 5496137016752 5544994890136 5691835864528 5779026422026 5791291853798 5844435308504 5919354818624 6034259145148 6441650832032 6442193388488 6535946722624 6726715112624 6844254009034 6855972188822 7112647904032 7175875740176 7426780486336 7557188398034 7624367973937 7642723095736 7724300672192 7890954266732 7999336890688 8036098549193 8139112875608 8317081015948 8405856613856 8423697241888 8705160733984 8857269894044 8931222652222 9249233279858 9383837506384 9873677914672 9890582829776 10211823168712 10508744256637 10620913424264 10901255254208 10992274033504 11089989780272 11383671729056 11558052844052 11582583707596 11688870617008 12068518290296 12419425030571 12883301664064 12884386776976 13453430225248 13688508018068 13711944377644 14225295808064 14351751480352 15114376796068 15248735947874 15285446191472 15781908533464 16072197098386 16278225751216 16594212649157 16634162031896 16811713227712 16847394483776 17410321467968 17714539788088 17862445304444 18498466559716 18767675012768 19747355829344 19781165659552 20423646337424 21017488513274 21241826848528 21700124233513 21984548067008 22179979560544 22767343458112 22871972793857 23116105688104 23165167415192 23377741234016 24137036580592 24838850061142 25645601366879 25768773553952 26906860450496 27030513301831 27377016036136 27423888755288 28703502960704 30228753592136 30497471895748 30570892382944 31563817066928 32144394196772 32556451502432 33188425298314 33268324063792 35347594317779 35429079576176 35724890608888 36996933119432 37535350025536 37643397049687 37707847038521 39494711658688 39562331319104 40847292674848 42034977026548 42483653697056 43400248467026 44359959121088 44563819227343 45743945587714 46232211376208 46330334830384 46755482468032 48274073161184 49121724587221 49677700122284 51291202733758 51537547107904 54061026603662 54754032072272 54847777510576 58275763604987 60457507184272 60994943791496 61141784765888 63127634133856 64288788393544 65112903004864 66376850596628 66536648127584 70695188635558 70858159152352 71449781217776 73993866238864 75286794099374 75415694077042 81694585349696 84069954053096 84967307394112 86800496934052 89127638454686 91487891175428 92464422752416 92660669660768 96548146322368 98243449174442 99355400244568 102582405467516 108122053207324 109508064144544 109695555021152 116551527209974 120915014368544 121989887582992 126255268267712 126835485493207 128577576787088 132753701193256 133073296255168 136613675336281 141390377271116 141716318304704 142899562435552 147987732477728 150573588198748 150831388154084 168139908106192 173600993868104 178255276909372 182975782350856 184928845504832 185321339321536 196486898348884 198710800489136 205164810935032 216244106414648 219016128289088 219391110042304 233103054419948 241830028737088 243979775165984 253670970986414 257155153574176 265507402386512 273227350672562 282101615035669 282780754542232 285799124871104 295975464955456 297335646320141 301147176397496 301662776308168 336279816212384 347201987736208 356510553818744 365951564701712 388823537495569 392973796697768 397421600978272 410329621870064 432488212829296 459518726131127 466206108839896 487959550331968 490202011500773 507341941972828 514310307148352 531014804773024 546454701345124 564203230071338 565561509084464 594671292640282 602294352794992 603325552616336 641033399654857 672559632424768 694403975472416 713021107637488 731903129403424 757584926864831 777647074991138 785947593395536 794843201956544 820659243740128 864976425658592 919037452262254 932412217679792 980404023001546 1014683883945656 1062029609546048 1092909402690248 1128406460142676 1131123018168928 1189342585280564 1204588705589984 1206651105232672 1282066799309714 1388807950944832 1395190340425277 1426042215274976 1463806258806848 1515169853729662 1555294149982276 1571895186791072 1641318487480256 1648861311411691 1729952851317184 1838074904524508 1864824435359584 1960808046003092 2029367767891312 2156203253384519 2185818805380496 2256812920285352 2262246036337856 2378685170561128 2409177411179968 2413302210465344 2564133598619428 2790380680850554 2852084430549952 3030339707459324 3110588299964552 3143790373582144 3297722622823382 3676149809049016 3729648870719168 3921616092006184 4058735535782624 4312406506769038 4371637610760992 4513625840570704 4757370341122256 5054705987442397 5128267197238856 5580761361701108 6060679414918648 6221176599929104 6595445245646764 7352299618098032 7843232184012368 8117471071565248 8333434195513141 8624813013538076 8743275221521984 9027251681141408 9514740682244512 10109411974884794 10256534394477712 11161522723402216 12121358829837296 12442353199858208 13190890491293528 14704599236196064 15686464368024736 16666868391026282 17249626027076152 18054503362282816 18137474425528601 19029481364489024 20218823949769588 20513068788955424 22323045446804432 23718235787229709 24242717659674592 24884706399716416 26381780982587056 28030642293998747 29409198472392128 31372928736049472 33333736782052564 34499252054152304 36274948851057202 40437647899539176 41026137577910848 44646090893608864 47436471574459418 48485435319349184 52763561965174112 56061284587997494 66667473564105128 68998504108304608 72549897702114404 80875295799078352 89292181787217728 94872943148918836 105527123930348224 112122569175994988 133334947128210256 137997008216609216 145099795404228808 161750591598156704 189745886297837672 224245138351989976 266669894256420512 290199590808457616 308337065233986217 323501183196313408 379491772595675344 448490276703979952 533339788512841024 580399181616915232 616674130467972434 758983545191350688 896980553407959904 1160798363233830464 1233348260935944868 1517967090382701376 1793961106815919808 2466696521871889736 4933393043743779472 9866786087487558944 19733572174975117888
- Sum of all divisors σ(n): 50908390983594934272
- Sum of proper divisors (its aliquot sum) s(n): 31174818808619816384
- 19733572174975117888 is an abundant number, because the sum of its proper divisors (31174818808619816384) is greater than itself. Its abundance is 11441246633644698496
Bases of 19733572174975117888
- Binary: 100010001110110111011101101010111000101101110110010101010010000002
- Hexadecimal: 0x111DBBB5716ECAA40
- Base-36: 45XCNIQTPBKN4
Squares and roots of 19733572174975117888
- 19733572174975117888 squared (197335721749751178882) is 389413870784952204718963751919497580544
- 19733572174975117888 cubed (197335721749751178883) is 7684526725071288796199822081039736110803698609417175171072
-
The
square root of 19733572174975117888 is 4442248549.4369985655 -
The
cube root of 19733572174975117888 is 2702310.4217853899
Scales and comparisons
How big is 19733572174975117888?- 19,733,572,174,975,117,888 seconds is equal to 293,274,701,009 years, 3 weeks, 3 days, 15 hours, 30 minutes, 7 seconds.
-
To count from 1 to 19,733,572,174,975,117,888 would take you about two hundred ninety-three billion, two hundred seventy-four million, seven hundred one thousand and nine years!
This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
- A cube with a volume of 19733572174975117888 cubic inches would be around 225192.5 feet tall.
Recreational maths with 19733572174975117888
- 19733572174975117888 backwards is 88871157947127533791
- The number of decimal digits it has is: 20
- The sum of 19733572174975117888's digits is 103
- More coming soon!
Link to this page
HTML: To link to this page, just copy and paste the link below into your blog, web page or email.
BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:
Cite this page
MLA style:
"Number 19733572174975117888 - Facts about the integer". Numbermatics.com. 2024. Web. 5 June 2024.
APA style:
Numbermatics. (2024). Number 19733572174975117888 - Facts about the integer. Retrieved 5 June 2024, from https://numbermatics.com/n/19733572174975117888/
Chicago style:
Numbermatics. 2024. "Number 19733572174975117888 - Facts about the integer". https://numbermatics.com/n/19733572174975117888/
The information we have on file for 19733572174975117888 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
Keywords: Divisors of 19733572174975117888, math, Factors of 19733572174975117888, curriculum, school, college, exams, university, Prime factorization of 19733572174975117888, STEM, science, technology, engineering, physics, economics, calculator, nineteen quintillion, seven hundred thirty-three quadrillion, five hundred seventy-two trillion, one hundred seventy-four billion, nine hundred seventy-five million, one hundred seventeen thousand, eight hundred eighty-eight.