1206549528426000
1,206,549,528,426,000 is an even composite number composed of six prime numbers multiplied together.
1206549528426000 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of two thousand, one hundred sixty divisors.
Prime factorization of 1206549528426000:
24 × 32 × 53 × 112 × 533 × 612
(2 × 2 × 2 × 2 × 3 × 3 × 5 × 5 × 5 × 11 × 11 × 53 × 53 × 53 × 61 × 61)See below for interesting mathematical facts about the number 1206549528426000 from the Numbermatics database.
Names of 1206549528426000
- Cardinal: 1206549528426000 can be written as One quadrillion, two hundred six trillion, five hundred forty-nine billion, five hundred twenty-eight million, four hundred twenty-six thousand.
Scientific notation
- Scientific notation: 1.206549528426 × 1015
Factors of 1206549528426000
Divisors of 1206549528426000
- Number of divisors d(n): 2160
-
Complete list of divisors:
1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 25 30 33 36 40 44 45 48 50 53 55 60 61 66 72 75 80 88 90 99 100 106 110 120 121 122 125 132 144 150 159 165 176 180 183 198 200 212 220 225 240 242 244 250 264 265 275 300 305 318 330 360 363 366 375 396 400 424 440 450 477 484 488 495 500 528 530 549 550 583 600 605 610 636 660 671 720 726 732 750 792 795 825 848 880 900 915 954 968 976 990 1000 1060 1089 1098 1100 1125 1166 1200 1210 1220 1272 1320 1325 1342 1375 1452 1464 1500 1525 1584 1590 1650 1749 1800 1815 1830 1908 1936 1980 2000 2013 2120 2178 2196 2200 2250 2332 2385 2420 2440 2475 2544 2640 2650 2684 2745 2750 2809 2904 2915 2928 3000 3025 3050 3180 3233 3300 3355 3498 3600 3630 3660 3721 3816 3960 3975 4026 4125 4240 4356 4392 4400 4500 4575 4664 4770 4840 4880 4950 5247 5300 5368 5445 5490 5500 5618 5808 5830 6000 6039 6050 6100 6360 6413 6466 6600 6625 6710 6996 7260 7320 7381 7442 7625 7632 7920 7950 8052 8250 8427 8712 8745 8784 9000 9075 9150 9328 9540 9680 9699 9900 10065 10494 10600 10736 10890 10980 11000 11163 11236 11660 11925 12078 12100 12200 12375 12720 12826 12932 13200 13250 13420 13725 13992 14045 14520 14575 14640 14762 14884 15125 15250 15900 16104 16165 16500 16775 16854 17424 17490 18000 18150 18300 18605 19080 19239 19398 19800 19875 20130 20988 21200 21780 21960 22000 22143 22326 22472 22875 23320 23850 24156 24200 24400 24750 25281 25652 25864 26235 26500 26840 27225 27450 27984 28090 29040 29097 29150 29524 29768 30195 30250 30500 30899 31800 32065 32208 32330 33000 33489 33550 33708 34980 35563 36300 36600 36905 37210 38160 38478 38796 39600 39750 40260 40931 41976 42135 43560 43725 43920 44286 44652 44944 45375 45750 46640 47700 48312 48400 48495 49500 50325 50562 51304 51728 52470 53000 53680 54450 54900 55815 56180 57717 58194 58300 59048 59536 59625 60390 60500 61000 61798 63600 64130 64660 66000 66429 66978 67100 67416 68625 69960 70225 71126 72600 72875 73200 73810 74420 76956 77592 79500 80520 80825 81862 83875 83952 84270 87120 87450 88572 89304 90750 91500 92697 93025 95400 96195 96624 96990 99000 100650 101124 102608 104940 106000 106689 108900 109800 110715 111630 112360 115434 116388 116600 118096 119250 120780 121000 122000 122793 123596 126405 128260 129320 131175 132858 133956 134200 134832 136125 137250 139920 140450 142252 145200 145485 145750 147620 148840 148877 150975 153912 154495 155184 159000 160325 161040 161650 163724 167445 167750 168540 171349 174900 177144 177815 178608 181500 183000 184525 185394 186050 190800 192390 193980 197213 198000 201300 202248 204655 209880 210675 213378 217800 218625 219600 221430 223260 224720 230868 232776 233200 238500 241560 242000 242475 245586 247192 251625 252810 256520 258640 262350 265716 267912 268400 272250 274500 278091 279075 280900 284504 288585 290970 291500 295240 297680 297754 301950 307824 308990 318000 320067 320650 323300 327448 332145 334890 335500 337080 339889 342698 349800 351125 354288 355630 363000 366000 368379 369050 370788 372100 384780 387960 391193 394426 402600 404125 404496 409310 419760 421350 426756 435600 437250 442860 446520 446631 450241 461736 463485 465125 465552 477000 480975 483120 484950 491172 494384 503250 505620 513040 514047 524700 531432 533445 535824 544500 549000 553575 556182 558150 561800 569008 577170 581940 583000 590480 591639 595508 603900 613965 617980 632025 640134 641300 646600 654896 655875 664290 669780 671000 674160 679778 685396 699600 702250 711260 726000 727425 736758 738100 741576 744200 744385 754875 769560 772475 775920 782386 788852 801625 805200 808250 818620 837225 842700 853512 856745 874500 885720 889075 893040 893262 900482 922625 923472 926970 930250 954000 961950 969900 982344 986065 1006500 1011240 1019667 1023275 1028094 1049400 1053375 1062864 1066890 1089000 1098000 1107150 1112364 1116300 1123600 1154340 1163880 1166000 1173579 1183278 1191016 1207800 1212375 1227930 1235960 1264050 1280268 1282600 1293200 1311750 1328580 1339560 1339893 1342000 1350723 1359556 1370792 1390455 1395375 1404500 1422520 1442925 1454850 1473516 1476200 1483152 1488400 1488770 1509750 1539120 1542141 1544950 1564772 1577704 1600335 1603250 1616500 1637240 1637647 1660725 1674450 1685400 1699445 1707024 1713490 1749000 1771440 1774917 1778150 1786524 1800964 1841895 1845250 1853940 1860500 1884839 1923900 1939800 1955965 1964688 1972130 2013000 2022480 2039334 2046550 2056188 2098800 2106750 2133780 2169343 2178000 2214300 2224728 2232600 2233155 2251205 2308680 2317425 2327760 2347158 2366556 2382032 2404875 2415600 2424750 2455860 2471920 2528100 2560536 2565200 2570235 2623500 2657160 2667225 2679120 2679786 2701446 2719112 2741584 2767875 2780910 2790750 2809000 2845040 2885850 2909700 2947032 2952400 2958195 2977540 3019500 3059001 3069825 3084282 3089900 3129544 3155408 3160125 3200670 3206500 3233000 3274480 3275294 3321450 3348900 3370800 3398890 3426980 3498000 3520737 3549834 3556300 3573048 3601928 3637125 3683790 3690500 3707880 3721000 3721925 3769678 3847800 3862375 3879600 3911930 3944260 4026000 4052169 4078668 4093100 4112376 4186125 4213500 4267560 4283725 4338686 4428600 4445375 4449456 4465200 4466310 4502410 4617360 4634850 4694316 4733112 4809750 4849500 4911720 4912941 4930325 5056200 5098335 5116375 5121072 5140470 5247000 5314320 5334450 5359572 5402892 5438224 5535750 5561820 5581500 5618000 5654517 5771700 5819400 5867895 5894064 5916390 5955080 6039000 6118002 6139650 6168564 6179800 6259088 6320250 6401340 6413000 6466000 6508029 6550588 6642900 6697800 6699465 6753615 6797780 6853960 6952275 7041474 7099668 7112600 7146096 7203856 7214625 7274250 7367580 7381000 7415760 7442000 7443850 7539356 7695600 7710705 7724750 7823860 7888520 8001675 8104338 8157336 8186200 8188235 8224752 8303625 8372250 8427000 8497225 8535120 8567450 8677372 8857200 8874585 8890750 8932620 9004820 9081497 9209475 9269700 9388632 9424195 9466224 9619500 9699000 9779825 9823440 9825882 9860650 10112400 10196670 10232750 10280940 10452289 10494000 10668900 10719144 10805784 10846715 11071500 11123640 11163000 11165775 11256025 11309034 11543400 11587125 11638800 11735790 11832780 11910160 12078000 12236004 12279300 12337128 12359600 12640500 12802680 12826000 12851175 13016058 13101176 13285800 13336125 13395600 13398930 13507230 13595560 13707920 13904550 14082948 14199336 14225200 14429250 14548500 14735160 14738823 14762000 14790975 14887700 15078712 15295005 15349125 15421410 15449500 15647720 15777040 16003350 16208676 16314672 16372400 16376470 16607250 16744500 16854000 16963551 16994450 17134900 17354744 17603685 17749170 17781500 17865240 18009640 18014117 18162994 18418950 18539400 18609625 18777264 18848390 19239000 19398000 19524087 19559650 19651764 19721300 20260845 20393340 20465500 20561880 20733229 20904578 21337800 21418625 21438288 21611568 21693430 22143000 22247280 22326000 22331550 22512050 22618068 23086800 23174250 23471580 23665560 23862773 24472008 24558600 24564705 24651625 24674256 25281000 25491675 25605360 25702350 26032116 26202352 26571600 26672250 26797860 27014460 27191120 27244491 27809100 28165896 28272585 28398672 28858500 29097000 29339475 29470320 29477646 29581950 29775400 30157424 30590010 30698250 30842820 30899000 31295440 31356867 32006700 32417352 32540145 32752940 33214500 33489000 33497325 33768075 33927102 33988900 34269800 34709488 34761375 35207370 35498340 35563000 35730480 36019280 36028234 36325988 36837900 37078800 37219250 37696780 38478000 38553525 39048174 39119300 39303528 39442600 40008375 40521690 40786680 40931000 40941175 41123760 41466458 41809156 42486125 42675600 42837250 43386860 44286000 44372925 44663100 45024100 45236136 45407485 46047375 46348500 46943160 47120975 47331120 47725546 48899125 48944016 49117200 49129410 49303250 50562000 50983350 51404700 52064232 52261445 53344500 53595720 54028920 54042351 54233575 54488982 55618200 55828875 56280125 56331792 56545170 57717000 58194000 58678950 58955292 59163900 59550800 61180020 61396500 61685640 61798000 62199687 62713734 64013400 64255875 64834704 65080290 65505880 66429000 66978000 66994650 67536150 67854204 67977800 68539600 69522750 70414740 70996680 71126000 71588319 72056468 72651976 73675800 73694115 73954875 74438500 75393560 76475025 77107050 78096348 78238600 78607056 78885200 80016750 81043380 81573360 81733473 81862000 81882350 82932916 83618312 84817755 84972250 85674500 86773720 88018425 88745850 89326200 90048200 90070585 90472272 90814970 92094750 92697000 93886320 94070601 94241950 95451092 97620435 97798250 98258820 98606500 99896467 101304225 101966700 102809400 103666145 104128464 104522890 106689000 107191440 108057840 108084702 108467150 108977964 111236400 111657750 112560250 113090340 114975179 115434000 117357900 117910584 118327800 119313865 122360040 122793000 122823525 123371280 124399374 125427468 127458375 128026800 128511750 130160580 131011760 132858000 133989300 135072300 135708408 135955600 136222455 139045500 140829480 141362925 141993360 143176638 144112936 145303952 146697375 147351600 147388230 147909750 148877000 150787120 152950050 154214100 156192696 156477200 156784335 160033500 162086760 162127053 162700725 163466946 163764700 165865832 167236624 167486625 168840375 169635510 169944500 171349000 173547440 176036850 177491700 178652400 180096400 180141170 181629940 184189500 185394000 186599061 188141202 188483900 190902184 192767625 195240870 195596500 196517640 197213000 199792934 202608450 203933400 204705875 205618800 207332290 209045780 213378000 214764957 216169404 216934300 217955928 221864625 223315500 225120500 226180680 227037425 229950358 234715800 235604875 235821168 236655600 238627730 244720080 245586000 245647050 248798748 250854936 254916750 257023500 260321160 261307225 267978600 270144600 270211755 271167875 271416816 272444910 278091000 281658960 282725850 286353276 288225872 293394750 294776460 295819500 297754000 299689401 305900100 308428200 310998435 312385392 313568670 320067000 324173520 324254106 325401450 326933892 327529400 331731664 334973250 337680750 339271020 339889000 342698000 344925537 352073700 354983400 357941595 360282340 363259880 368379000 368470575 373198122 376282404 376967800 381804368 382375125 385535250 390481740 391193000 393035280 394426000 399585868 405216900 407866800 408667365 409411750 414664580 418091560 424088775 429529914 432338808 433868600 435911856 440092125 443729250 446631000 450241000 450352925 452361360 454074850 459900716 469431600 470353005 471209750 477255460 488102175 491294100 497597496 499482335 501709872 506521125 509833500 514047000 518330725 520642320 522614450 535957200 540289200 540423510 542335750 544889820 553971317 556182000 565451700 572706552 574875895 586789500 589552920 591639000 596569325 599378802 611800200 614117625 616856400 621996870 627137340 640134000 648508212 650802900 653867784 655058800 669946500 675361500 678542040 679778000 681112275 689851074 704147400 706814625 709966800 715883190 720564680 726519760 736758000 736941150 746396244 752564808 753935600 764750250 771070500 780963480 782386000 783921675 799171736 810433800 810635265 813503625 817334730 818823500 829329160 836183120 848177550 859059828 864677616 867737200 880184250 887458500 893262000 899068203 900482000 900705850 908149700 919801432 932995305 940706010 942419500 954510920 976204350 982588200 995194992 998964670 1013042250 1019667000 1028094000 1034776611 1036661450 1045228900 1073824785 1080847020 1084671500 1089779640 1098861137 1107942634 1130903400 1135187125 1145413104 1149751790 1173579000 1179105840 1183278000 1193138650 1198757604 1223600400 1228235250 1243993740 1254274680 1264726969 1297016424 1301605800 1306536125 1307735568 1339893000 1350723000 1351058775 1357084080 1362224550 1379702148 1408294800 1413629250 1431766380 1441129360 1473882300 1492792488 1498447005 1505129616 1529500500 1542141000 1554992175 1561926960 1567843350 1598343472 1620867600 1621270530 1627007250 1634669460 1637647000 1658658320 1661913951 1696355100 1718119656 1724627685 1760368500 1774917000 1789707975 1798136406 1801411700 1816299400 1839602864 1842352875 1865990610 1881412020 1884839000 1909021840 1952408700 1965176400 1997929340 2026084500 2039334000 2043336825 2069553222 2073322900 2090457800 2120443875 2147649570 2161694040 2169343000 2179559280 2197722274 2215885268 2251764625 2261806800 2270374250 2299503580 2347158000 2351765025 2386277300 2397515208 2440510875 2456470500 2487987480 2497411675 2508549360 2529453938 2591653625 2594032848 2603211600 2613072250 2679786000 2701446000 2702117550 2724449100 2759404296 2769856585 2827258500 2863532760 2874379475 2947764600 2982846625 2985584976 2996894010 3059001000 3084282000 3109984350 3135686700 3242541060 3254014500 3269338920 3275294000 3296583411 3323827902 3392710200 3405561375 3436239312 3449255370 3520737000 3549834000 3579415950 3596272812 3602823400 3632598800 3684705750 3731981220 3762824040 3769678000 3794180907 3904817400 3919608375 3995858680 4052169000 4053176325 4086673650 4139106444 4146645800 4180915600 4240887750 4295299140 4323388080 4338686000 4395444548 4431770536 4495341015 4503529250 4540748500 4599007160 4664976525 4703530050 4772554600 4795030416 4881021750 4912941000 4975974960 4985741853 4994823350 5058907876 5173883055 5183307250 5226144500 5369123925 5404235100 5448898200 5494305685 5518808592 5539713170 5654517000 5727065520 5748758950 5895529200 5965693250 5993788020 6093684487 6118002000 6219968700 6271373400 6323634845 6485082120 6508029000 6538677840 6593166822 6647655804 6755293875 6785420400 6811122750 6898510740 7041474000 7158831900 7192545624 7205646800 7369411500 7463962440 7492235025 7525648080 7588361814 7774960875 7809634800 7839216750 7991717360 8104338000 8106352650 8173347300 8278212888 8293291600 8309569755 8481775500 8590598280 8623138425 8790889096 8863541072 8948539875 8990682030 9007058500 9081497000 9198014320 9329953050 9407060100 9545109200 9762043500 9825882000 9889750233 9971483706 9989646700 10117815752 10216684125 10347766110 10366614500 10452289000 10738247850 10808470200 10897796400 10988611370 11079426340 11309034000 11382542721 11497517900 11758825125 11931386500 11987576040 12187368974 12439937400 12487058375 12542746800 12647269690 12970164240 13016058000 13186333644 13295311608 13510587750 13622245500 13797021480 13849282925 14317663800 14371897375 14385091248 14738823000 14927924880 14984470050 15176723628 15549921750 15678433500 16212705300 16346694600 16482917055 16556425776 16619139510 16963551000 17181196560 17246276850 17581778192 17897079750 17981364060 18014117000 18162994000 18281053461 18659906100 18814120200 18970904535 19524087000 19779500466 19942967412 19979293400 20235631504 20265881625 20433368250 20695532220 20733229000 20904578000 21476495700 21616940400 21977222740 22158852680 22476705075 22765085442 22995035800 23324882625 23517650250 23862773000 23975152080 24374737948 24879874800 24928709265 24974116750 25294539380 25869415275 26372667288 26590623216 26845619625 27021175500 27244491000 27471528425 27594042960 27698565850 28635327600 28743794750 29477646000 29968940100 30353447256 30468422435 31099843500 31356867000 31618174225 32425410600 32693389200 32965834110 33238279020 33927102000 34492553700 35794159500 35962728120 36028234000 36562106922 37319812200 37461175125 37628240400 37941809070 39048174000 39559000932 39885934824 39958586800 40531763250 40866736500 41391064440 41466458000 41547848775 42952991400 43115692125 43954445480 44317705360 44953410150 45530170884 45990071600 46649765250 47035300500 47725546000 48749475896 49448751165 49857418530 49948233500 50589078760 51738830550 52745334576 53691239250 54042351000 54488982000 54843160383 54943056850 55397131700 56912713605 57487589500 59937880200 60706894512 60936844870 62199687000 62713734000 63236348450 64850821200 65931668220 66476558040 67030529357 68985107400 69246414625 71588319000 71925456240 73124213844 74639624400 74922350250 75883618140 79118001864 79771869648 81063526500 81733473000 82414585275 82782128880 83095697550 85905982800 86231384250 87908890960 89906820300 91060341768 91405267305 93299530500 94070601000 94854522675 97498951792 98897502330 99714837060 99896467000 101178157520 103477661100 107382478500 108084702000 109686320766 109886113700 110794263400 112383525375 113825427210 114975179000 119875760400 121873689740 124399374000 124643546325 126472696900 129347076375 131863336440 132953116080 134061058714 137357642125 137970214800 138492829250 143176638000 146248427688 149844700500 151767236280 152342112175 158090871125 158236003728 162127053000 163466946000 164829170550 166191395100 172462768500 179813640600 182120683536 182810534610 186599061000 188141202000 189709045350 197795004660 199429674120 199792934000 201091588071 206955322200 207739243875 214764957000 219372641532 219772227400 221588526800 224767050750 227650854420 229950358000 243747379480 247243755825 249287092650 252945393800 258694152750 263726672880 268122117428 274215801915 274715284250 276985658500 284563568025 292496855376 299689401000 303534472560 304684224350 316181742250 324254106000 329658341100 332382790200 335152646785 344925537000 359627281200 365621069220 373198122000 379418090700 395590009320 398859348240 402183176142 412072926375 413910644400 415478487750 429529914000 438745283064 439544454800 449534101500 455301708840 457026336525 474272613375 487494758960 494487511650 498574185300 505890787600 517388305500 536244234856 548431603830 549430568500 553971317000 569127136050 599378802000 603274764213 609368448700 623217731625 632363484500 659316682200 664765580400 670305293570 689851074000 731242138440 758836181400 761710560875 791180018640 804366352284 824145852750 830956975500 877490566128 899068203000 910603417680 914052673050 948545226750 988975023300 997148370600 1005457940355 1034776611000 1072488469712 1096863207660 1098861137000 1107942634000 1138254272100 1206549528426 1218736897400 1236218779125 1246435463250 1264726969000 1318633364400 1340610587140 1371079009575 1422817840125 1462484276880 1517672362800 1523421121750 1608732704568 1648291705500 1661913951000 1675763233925 1798136406000 1828105346100 1897090453500 1977950046600 1994296741200 2010915880710 2069553222000 2193726415320 2197722274000 2276508544200 2285131682625 2413099056852 2437473794800 2472437558250 2492870926500 2529453938000 2681221174280 2742158019150 2845635680250 3016373821065 3046842243500 3217465409136 3296583411000 3323827902000 3351526467850 3656210692200 3794180907000 3955900093200 4021831761420 4387452830640 4553017088400 4570263365250 4826198113704 4944875116500 4985741853000 5027289701775 5362442348560 5484316038300 5691271360500 6032747642130 6093684487000 6593166822000 6703052935700 6855395047875 7312421384400 7588361814000 8043663522840 8378816169625 9140526730500 9652396227408 9889750233000 9971483706000 10054579403550 10968632076600 11382542721000 12065495284260 12187368974000 13406105871400 13710790095750 15081869105325 16087327045680 16757632339250 18281053461000 19779500466000 20109158807100 21937264153200 22765085442000 24130990568520 25136448508875 26812211742800 27421580191500 30163738210650 33515264678500 36562106922000 40218317614200 48261981137040 50272897017750 54843160383000 60327476421300 67030529357000 75409345526625 80436635228400 100545794035500 109686320766000 120654952842600 134061058714000 150818691053250 201091588071000 241309905685200 301637382106500 402183176142000 603274764213000 1206549528426000
- Sum of all divisors σ(n): 4799739934014480
- Sum of proper divisors (its aliquot sum) s(n): 3593190405588480
- 1206549528426000 is an abundant number, because the sum of its proper divisors (3593190405588480) is greater than itself. Its abundance is 2386640877162480
Bases of 1206549528426000
- Binary: 1000100100101011001101101000000101110110110000100002
- Hexadecimal: 0x44959B40BB610
- Base-36: BVOP791ES0
Squares and roots of 1206549528426000
- 1206549528426000 squared (12065495284260002) is 1455761764545002982037476000000
- 1206549528426000 cubed (12065495284260003) is 1756448670512374994432080416459292776000000000
-
The
square root of 1206549528426000 is 34735421.8115456315 -
The
cube root of 1206549528426000 is 106458.8371543383
Scales and comparisons
How big is 1206549528426000?- 1,206,549,528,426,000 seconds is equal to 38,364,542 years, 46 weeks, 6 days, 1 hour.
-
To count from 1 to 1,206,549,528,426,000 would take you about one hundred fifteen million, ninety-three thousand, six hundred twenty-eight 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 1206549528426000 cubic inches would be around 8871.6 feet tall.
Recreational maths with 1206549528426000
- 1206549528426000 backwards is 0006248259456021
- The number of decimal digits it has is: 16
- The sum of 1206549528426000's digits is 54
- 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 1206549528426000 - Facts about the integer". Numbermatics.com. 2024. Web. 10 June 2024.
APA style:
Numbermatics. (2024). Number 1206549528426000 - Facts about the integer. Retrieved 10 June 2024, from https://numbermatics.com/n/1206549528426000/
Chicago style:
Numbermatics. 2024. "Number 1206549528426000 - Facts about the integer". https://numbermatics.com/n/1206549528426000/
The information we have on file for 1206549528426000 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 1206549528426000, math, Factors of 1206549528426000, curriculum, school, college, exams, university, Prime factorization of 1206549528426000, STEM, science, technology, engineering, physics, economics, calculator, one quadrillion, two hundred six trillion, five hundred forty-nine billion, five hundred twenty-eight million, four hundred twenty-six thousand.