16948855978323984
16,948,855,978,323,984 is an even composite number composed of five prime numbers multiplied together.
What does the number 16948855978323984 look like?
This visualization shows the relationship between its 5 prime factors (large circles) and 2025 divisors.
16948855978323984 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of two thousand and twenty-five divisors.
Prime factorization of 16948855978323984:
24 × 34 × 118 × 132 × 192
(2 × 2 × 2 × 2 × 3 × 3 × 3 × 3 × 11 × 11 × 11 × 11 × 11 × 11 × 11 × 11 × 13 × 13 × 19 × 19)See below for interesting mathematical facts about the number 16948855978323984 from the Numbermatics database.
Names of 16948855978323984
- Cardinal: 16948855978323984 can be written as Sixteen quadrillion, nine hundred forty-eight trillion, eight hundred fifty-five billion, nine hundred seventy-eight million, three hundred twenty-three thousand, nine hundred eighty-four.
Scientific notation
- Scientific notation: 1.6948855978323984 × 1016
Factors of 16948855978323984
Divisors of 16948855978323984
- Number of divisors d(n): 2025
-
Complete list of divisors:
1 2 3 4 6 8 9 11 12 13 16 18 19 22 24 26 27 33 36 38 39 44 48 52 54 57 66 72 76 78 81 88 99 104 108 114 117 121 132 143 144 152 156 162 169 171 176 198 208 209 216 228 234 242 247 264 286 297 304 312 324 338 342 351 361 363 396 418 429 432 456 468 484 494 507 513 528 572 594 624 627 648 676 684 702 722 726 741 792 836 858 891 912 936 968 988 1014 1026 1053 1083 1089 1144 1188 1254 1287 1296 1331 1352 1368 1404 1444 1452 1482 1521 1539 1573 1584 1672 1716 1782 1859 1872 1881 1936 1976 2028 2052 2106 2166 2178 2223 2288 2299 2376 2508 2574 2662 2704 2717 2736 2808 2888 2904 2964 3042 3078 3146 3211 3249 3267 3344 3432 3564 3718 3762 3861 3952 3971 3993 4056 4104 4212 4332 4356 4446 4563 4598 4693 4719 4752 5016 5148 5324 5434 5577 5616 5643 5776 5808 5928 6084 6156 6292 6422 6498 6534 6669 6864 6897 7128 7436 7524 7722 7942 7986 8112 8151 8208 8424 8664 8712 8892 9126 9196 9386 9438 9633 9747 9801 10032 10296 10648 10868 11154 11286 11583 11856 11913 11979 12168 12312 12584 12844 12996 13068 13338 13689 13794 14079 14157 14256 14641 14872 15048 15444 15884 15972 16302 16731 16848 16929 17303 17328 17424 17784 18252 18392 18772 18876 19266 19494 19602 20007 20449 20592 20691 21296 21736 22308 22572 23166 23826 23958 24336 24453 24624 25168 25289 25688 25992 26136 26676 27378 27588 28158 28314 28899 29241 29282 29744 29887 30096 30888 31768 31944 32604 33462 33858 34606 35321 35568 35739 35937 36504 36784 37544 37752 38532 38988 39204 40014 40898 41382 42237 42471 43472 43681 43923 44616 45144 46332 47652 47916 48906 50193 50578 51376 51623 51909 51984 52272 53352 54756 55176 56316 56628 57798 58482 58564 59774 61009 61347 61776 62073 63536 63888 65208 66924 67716 69212 70642 71478 71874 73008 73359 75088 75504 75867 77064 77976 78408 80028 81796 82764 84474 84942 86697 87362 87846 89232 89661 90288 92664 95304 95832 97812 100386 101156 103246 103818 105963 106704 107217 107811 109512 110352 112632 113256 115596 116964 117128 119548 122018 122694 124146 126711 127413 130416 131043 131769 133848 135432 138424 141284 142956 143748 146718 150579 151734 154128 154869 155727 155952 156816 160056 161051 163592 165528 168948 169884 173394 174724 175692 179322 183027 184041 185328 186219 190333 190608 191664 195624 200772 202312 206492 207636 211926 214434 215622 219024 220077 224939 225264 226512 227601 231192 233928 234256 239096 244036 245388 248292 253422 254826 260091 262086 263538 267696 268983 270864 276848 278179 282568 285912 287496 293436 301158 303468 309738 311454 317889 320112 321651 322102 327184 328757 331056 337896 339768 346788 349448 351384 358644 366054 368082 372438 380133 380666 388531 391248 393129 395307 401544 404624 412984 415272 423852 428868 431244 440154 449878 455202 462384 464607 467181 467856 478192 480491 483153 488072 490776 496584 506844 509652 520182 524172 527076 537966 549081 552123 556358 565136 567853 570999 571824 574992 586872 602316 606936 619476 622908 635778 643302 644204 657514 671099 674817 675792 679536 682803 693576 698896 702768 717288 732108 736164 744876 760266 761332 777062 786258 790614 803088 806949 825968 830544 834537 847704 857736 862488 880308 899756 910404 929214 934362 953667 960982 966306 976144 981552 986271 993168 1013688 1019304 1040364 1048344 1054152 1075932 1098162 1104246 1112716 1135706 1141998 1165593 1173744 1179387 1185921 1204632 1213872 1238952 1245816 1271556 1286604 1288408 1315028 1342198 1349634 1365606 1387152 1393821 1401543 1434576 1441473 1449459 1464216 1472328 1489752 1520532 1522664 1554124 1572516 1581228 1613898 1647243 1656369 1669074 1695408 1703559 1712997 1715472 1724976 1760616 1771561 1799512 1820808 1858428 1868724 1907334 1921964 1932612 1972542 2013297 2024451 2027376 2038608 2048409 2080728 2093663 2096688 2108304 2151864 2196324 2208492 2225432 2271412 2283996 2331186 2358774 2371842 2409264 2420847 2474329 2477904 2491632 2503611 2543112 2573208 2576816 2630056 2684396 2699268 2731212 2787642 2803086 2861001 2882946 2898918 2928432 2944656 2958813 2979504 3041064 3045328 3059969 3108248 3145032 3162456 3227796 3294486 3312738 3338148 3407118 3425994 3496779 3521232 3538161 3543122 3599024 3616327 3641616 3716856 3737448 3814668 3843928 3865224 3945084 4026594 4048902 4096818 4161456 4181463 4187326 4273841 4303728 4324419 4348377 4392648 4416984 4450864 4542824 4567992 4662372 4717548 4743684 4841694 4941729 4948658 5007222 5086224 5110677 5138991 5146416 5260112 5285401 5314683 5368792 5398536 5462424 5575284 5606172 5722002 5765892 5797836 5917626 6039891 6073353 6082128 6119938 6216496 6246383 6280989 6290064 6324912 6455592 6588972 6625476 6676296 6814236 6851988 6993558 7076322 7086244 7232654 7382089 7422987 7433712 7474896 7510833 7629336 7687856 7730448 7890168 8053188 8097804 8193636 8362926 8374652 8547682 8648838 8696754 8785296 8833968 8876439 9085648 9135984 9179907 9324744 9435096 9487368 9683388 9883458 9897316 10014444 10221354 10277982 10490337 10570802 10629366 10737584 10797072 10848981 10924848 11150568 11212344 11444004 11531784 11595672 11835252 12079782 12146706 12239876 12492766 12561978 12821523 12911184 12973257 13045131 13177944 13250952 13352592 13628472 13703976 13987116 14152644 14172488 14465308 14764178 14845974 15021666 15258672 15332031 15416973 15780336 15856203 15944049 16106376 16195608 16387272 16725852 16749304 17095364 17297676 17393508 17752878 18119673 18220059 18359814 18649488 18739149 18842967 18870192 18974736 19366776 19487171 19766916 19794632 20028888 20442708 20555964 20980674 21141604 21258732 21697962 22146267 22268961 22301136 22424688 22532499 22888008 23030293 23063568 23191344 23670504 24159564 24293412 24479752 24985532 25123956 25643046 25946514 26090262 26355888 26501904 26629317 27217619 27256944 27407952 27539721 27974232 28305288 28344976 28930616 29528356 29691948 30043332 30664062 30833946 31471011 31712406 31888098 32212752 32391216 32546943 32774544 33451704 33498608 33659659 34190728 34595352 34787016 35505756 36239346 36440118 36719628 37478298 37685934 38464569 38733552 38919771 38974342 39533832 39589264 39779597 40057776 40885416 41111928 41961348 42283208 42517464 43395924 44292534 44537922 45064998 45776016 45996093 46060586 47012251 47341008 47568609 47832147 48319128 48586824 48959504 49971064 50247912 51286092 51893028 52180524 53258634 54359019 54435238 55079442 55948464 56217447 56528901 56610576 57861232 58139411 58461513 59056712 59383896 60086664 61328124 61667892 62942022 63424812 63776196 65093886 66438801 66806883 66903408 67319318 68381456 68710213 69090879 69190704 69574032 71011512 72478692 72880236 73439256 74956596 75371868 76929138 77839542 77948684 79067664 79559194 81202979 81652857 81770832 82223856 82619163 83922696 84566416 85034928 86791848 88585068 89075844 90129996 91992186 92121172 94024502 95137218 95664294 96638256 97173648 97640829 99942128 100495824 100978977 102572184 103786056 104361048 106517268 108718038 108870476 110158884 112434894 113057802 115393707 116278822 116923026 118113424 118767792 119338791 120173328 122656248 123335784 125884044 126849624 127552392 130187772 132877602 133613766 134638636 137420426 138181758 141036753 142023024 142705827 143496441 144957384 145760472 146878512 149913192 150743736 153858276 155679084 155897368 159118388 162405958 163305714 165238326 167845392 168652341 169586703 173583696 174418233 175384539 177170136 178151688 180259992 183984372 184242344 188049004 190274436 191328588 195281658 199316403 200420649 201957954 205144368 206130639 207272637 207572112 208722096 213034536 214358881 217436076 217740952 220317768 224869788 226115604 230787414 232557644 233846052 238677582 243608937 244958571 245312496 246671568 247857489 251768088 253333223 253699248 255104784 260375544 265755204 267227532 269277272 274840852 276363516 282073506 285411654 286992882 289914768 291520944 292922487 299393809 299826384 301487472 302936931 307716552 311358168 311794736 318236776 324811916 326611428 330476652 337304682 339173406 346181121 348836466 350769078 354340272 356303376 358016373 360519984 367968744 368484688 370256249 376098008 380548872 382657176 390563316 398632806 400841298 403915908 412261278 414545274 423110259 426069072 428117481 428717762 434872152 435481904 437575567 440635536 449739576 452231208 461574828 465115288 467692104 477355164 487217874 489917142 495714978 503536176 505957023 506666446 517134761 520751088 523254699 526153617 531510408 534455064 538554544 549681704 552727032 564147012 570823308 573985764 585844974 597949209 598787618 605873862 615433104 618391917 621817911 622716336 636473552 639533521 643076643 649623832 653222856 660953304 674609364 678346812 692362242 697672932 701538156 716032746 730826811 734875713 735937488 740512498 752196016 755812343 759999669 761097744 765314352 781126632 797265612 801682596 807831816 824522556 829090548 846220518 856234962 857435524 869744304 875151134 893232769 898181427 899479152 904462416 908810793 923149656 930230576 935384208 954710328 974435748 979834284 991429956 1011914046 1013332892 1034269522 1046509398 1052307234 1063020816 1068910128 1074049119 1099363408 1105454064 1110768747 1128294024 1141646616 1147971528 1171689948 1195898418 1197575236 1211747724 1236783834 1243635822 1269330777 1279067042 1286153286 1299247664 1306445712 1312726701 1321906608 1349218728 1356693624 1384724484 1395345864 1403076312 1432065492 1461653622 1469751426 1481024996 1511624686 1519999338 1551404283 1562253264 1569764097 1578460851 1594531224 1603365192 1615663632 1649045112 1658181096 1692441036 1712469924 1714871048 1750302268 1786465538 1796362854 1817621586 1846299312 1855175751 1865453733 1909420656 1918600563 1929229929 1948871496 1959668568 1982859912 2023828092 2026665784 2068539044 2093018796 2104614468 2148098238 2192480433 2204627139 2221537494 2256588048 2267437029 2279999007 2283293232 2295943056 2343379896 2391796836 2395150472 2423495448 2473567668 2487271644 2538661554 2558134084 2572306572 2625453402 2679698307 2694544281 2698437456 2713387248 2726432379 2769448968 2786665453 2790691728 2806152624 2864130984 2923307244 2939502852 2962049992 3023249372 3039998676 3102808566 3139528194 3156921702 3189062448 3206730384 3222147357 3293331899 3298090224 3316362192 3332306241 3384882072 3424939848 3429742096 3500604536 3572931076 3592725708 3635243172 3710351502 3730907466 3807992331 3837201126 3858459858 3897742992 3919337136 3938180103 3965719824 4047656184 4053331568 4072818739 4137078088 4186037592 4209228936 4296196476 4384960866 4409254278 4443074988 4534874058 4559998014 4654212849 4686759792 4709292291 4783593672 4790300944 4813331237 4846990896 4947135336 4974543288 5077323108 5116268168 5144613144 5250906804 5359396614 5389088562 5452864758 5538897936 5565527253 5573330906 5688482371 5728261968 5755801689 5787689787 5846614488 5879005704 5924099984 6046498744 6079997352 6205617132 6279056388 6313843404 6444294714 6577441299 6586663798 6664612482 6769764144 6802311087 6839997021 6849879696 7001209072 7034868731 7145862152 7185451416 7270486344 7420703004 7461814932 7615984662 7674402252 7716919716 7876360206 8039094921 8083632843 8095312368 8145637478 8274156176 8313935773 8359996359 8372075184 8418457872 8592392952 8769921732 8818508556 8886149976 9069748116 9119996028 9308425698 9418584582 9567187344 9626662474 9825560459 9879995697 9894270672 9949086576 9996918723 10154646216 10232536336 10289226288 10501813608 10718793228 10778177124 10905729516 11131054506 11146661812 11376964742 11511603378 11575379574 11693228976 11758011408 11814540309 12092997488 12159994704 12218456217 12411234264 12558112776 12627686808 12888589428 13154882598 13173327596 13329224964 13604622174 13679994042 13962638547 14069737462 14291724304 14370902832 14439993711 14540972688 14841406008 14923629864 15231969324 15348804504 15433839432 15752720412 16078189842 16167265686 16291274956 16627871546 16719992718 17065447113 17184785904 17267405067 17363069361 17539843464 17637017112 17772299952 18139496232 18239992056 18616851396 18837169164 19253324948 19651120918 19759991394 19993837446 20309292432 20406933261 20519991063 21003627216 21104606193 21437586456 21556354248 21811459032 22262109012 22293323624 22753929484 23023206756 23150759148 23629080618 24117284763 24250898529 24436912434 24822468528 24941807319 25079989077 25116225552 25255373616 25777178856 26309765196 26346655192 26658449928 27209244348 27359988084 27925277094 28139474924 28879987422 29476681377 29639987091 29682812016 29847259728 29990756169 30463938648 30697609008 30867678864 31505440824 32156379684 32334531372 32582549912 33255743092 33439985436 34130894226 34534810134 34726138722 35079686928 35274034224 35443620927 36226650889 36278992464 36479984112 36655368651 37233702792 37674338328 38506649896 39302241836 39519982788 39987674892 40813866522 41039982126 41887915641 42209212386 42875172912 43112708496 43319981133 43622918064 44524218024 44586647248 45507858968 46046413512 46301518296 47258161236 48234569526 48501797058 48873824868 49883614638 50159978154 51196341339 51554357712 51802215201 52619530392 52693310384 52946643607 53316899856 54418488696 54719976168 55850554188 56278949848 57759974844 58953362754 59279974182 59981512338 60927877296 61220799783 62573306081 63010881648 63313818579 64312759368 64669062744 65165099824 66511486184 66879970872 68261788452 69069620268 69452277444 70887241854 72351854289 72453301778 73310737302 74467405584 74825421957 75239967231 75348676656 77013299792 77383556041 78604483672 79039965576 79975349784 81627733044 82079964252 83775831282 84418424772 86639962266 88430044131 88919961273 89048436048 91015717936 91453293503 92092827024 92603036592 94516322472 96469139052 97003594116 97747649736 99767229276 100319956308 102392682678 103604430402 105239060784 105893287214 108081165049 108679952667 108836977392 109439952336 109966105953 111701108376 112557899696 115519949688 117906725508 118559948364 119963024676 122441599566 125146612162 126627637158 128625518736 129338125488 129959943399 133022972368 133759941744 136523576904 138139240536 138904554888 141774483708 144703708578 144906603556 146621474604 149650843914 150479934462 153589024017 154767112082 157208967344 158079931152 158839930821 159950699568 163255466088 164159928504 167551662564 168836849544 173279924532 176860088262 177839922546 182906587006 187719918243 189032644944 189941455737 192938278104 194007188232 195495299472 199534458552 200639912616 204785365356 207208860804 211786574428 216162330098 217359905334 219932211906 223402216752 224476265871 225719901693 231039899376 232150668123 235813451016 237119896728 239926049352 244883199132 250293224324 253255274316 259919886798 265290132393 266759883819 273047153808 274359880509 276278481072 277809109776 283548967416 289407417156 289813207112 293242949208 299301687828 300959868924 307178048034 309534224164 317679861642 324243495147 326039858001 326510932176 328319857008 329898317859 335103325128 337673699088 346559849064 353720176524 355679845092 365813174012 375439836486 379882911474 385876556208 388014376464 389879830197 399068917104 401279825232 409570730712 414417721608 423573148856 432324660196 434719810668 439864423812 448952531742 451439803386 460767072051 464301336246 471626902032 474239793456 476519792463 479852098704 489766398264 500586448648 506510548632 519839773596 530580264786 533519767638 548719761018 563159754729 567097934832 569824367211 578814834312 579626414224 586485898416 598603375656 601919737848 614356096068 619068448328 635359723284 648486990294 652079716002 659796635718 670206650256 673428797613 688306366891 693119698128 696452004369 707440353048 711359690184 731626348024 750879672972 759765822948 779759660394 795870397179 819141461424 823079641527 828835443216 847146297712 864649320392 869439621336 879728847624 897905063484 902879606772 921534144102 928602672492 953039584926 972730485441 978119574003 979532796528 1001172897296 1005986228533 1013021097264 1039679547192 1061160529572 1067039535276 1097439522036 1126319509458 1139648734422 1157629668624 1188892815539 1197206751312 1203839475696 1228712192136 1238136896656 1270719446568 1296973980588 1304159432004 1319593271436 1346857595226 1376612733782 1392904008738 1414880706096 1422719380368 1429559377389 1463252696048 1501759345944 1519531645896 1559519320788 1591740794358 1646159283054 1689479264187 1729298640784 1738879242672 1759457695248 1795810126968 1805759213544 1843068288204 1857205344984 1906079169852 1945460970882 1956239148006 2011972457066 2064919100673 2079359094384 2089356013107 2122321059144 2134079070552 2194879044072 2252639018916 2279297468844 2377785631078 2457424384272 2469238924581 2541438893136 2593947961176 2608318864008 2639186542872 2693715190452 2753225467564 2785808017476 2859118754778 2918191456323 2934358722009 3003518691888 3017958685599 3039063291792 3119038641576 3183481588716 3292318566108 3378958528374 3566678446617 3591620253936 3611518427088 3686136576408 3714410689968 3812158339704 3890921941764 3912478296012 4023944914132 4129838201346 4178712026214 4244642118288 4268158141104 4288678132167 4389758088144 4505278037832 4558594937688 4755571262156 4938477849162 5068437792561 5187895922352 5216637728016 5278373085744 5387430380904 5506450935128 5571616034952 5718237509556 5836382912646 5868717444018 6035917371198 6194757302019 6238077283152 6268068039321 6366963177432 6584637132216 6757917056748 7133356893234 7372273152816 7407716773743 7624316679408 7781843883528 7824956592024 8047889828264 8259676402692 8357424052428 8577356264334 8754574368969 9010556075664 9053876056797 9117189875376 9511142524312 9876955698324 10136875585122 10700035339851 10774860761808 11012901870256 11143232069904 11436475019112 11672765825292 11737434888036 12071834742396 12389514604038 12536136078642 12733926354864 13077820970929 13169274264432 13515834113496 14266713786468 14815433547486 15563687767056 15649913184048 16095779656528 16519352805384 16714848104856 17154712528668 17509148737938 18107752113594 18584271906057 19022285048624 19753911396648 20273751170244 21400070679702 22872950038224 23345531650584 23474869776072 24143669484792 24779029208076 25072272157284 26155641941858 27031668226992 27161628170391 28533427572936 29630867094972 32100106019553 33038705610768 33429696209712 34309425057336 35018297475876 36215504227188 37168543812114 39233462912787 39507822793296 40547502340488 42800141359404 46691063301168 46949739552144 48287338969584 49558058416152 50144544314568 52311283883716 54323256340782 55752815718171 57066855145872 59261734189944 64200212039106 68618850114672 70036594951752 72431008454376 74337087624228 78466925825574 81095004680976 81484884511173 85600282718808 96300318058659 99116116832304 100289088629136 104622567767432 108646512681564 111505631436342 117700388738361 118523468379888 128400424078212 140073189903504 144862016908752 148674175248456 156933851651148 162969769022346 171200565437616 192600636117318 209245135534864 217293025363128 223011262872684 235400777476722 256800848156424 297348350496912 313867703302296 325939538044692 353101166215083 385201272234636 434586050726256 446022525745368 470801554953444 513601696312848 627735406604592 651879076089384 706202332430166 770402544469272 892045051490736 941603109906888 1059303498645249 1303758152178768 1412404664860332 1540805088938544 1883206219813776 2118606997290498 2824809329720664 4237213994580996 5649618659441328 8474427989161992 16948855978323984
- Sum of all divisors σ(n): 61667635364880237
- Sum of proper divisors (its aliquot sum) s(n): 44718779386556253
- 16948855978323984 is an abundant number, because the sum of its proper divisors (44718779386556253) is greater than itself. Its abundance is 27769923408232269
Bases of 16948855978323984
- Binary: 1111000011011011100101000010111110111111110000000100002
- Hexadecimal: 0x3C36E50BEFF010
- Base-36: 4MVV8Y30100
Squares and roots of 16948855978323984
- 16948855978323984 squared (169488559783239842) is 287263718973968652794457669632256
- 16948855978323984 cubed (169488559783239843) is 4868791400687529476028012539221570740864504827904
-
16948855978323984 is a
perfect square number . Itssquare root is 130187772 -
The
cube root of 16948855978323984 is 256870.0457730509
Scales and comparisons
How big is 16948855978323984?- 16,948,855,978,323,984 seconds is equal to 538,921,193 years, 44 weeks, 3 days, 22 hours, 26 minutes, 24 seconds.
-
To count from 1 to 16,948,855,978,323,984 would take you about one billion, six hundred sixteen million, seven hundred sixty-three thousand, five hundred eighty-one 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 16948855978323984 cubic inches would be around 21405.8 feet tall.
Recreational maths with 16948855978323984
- 16948855978323984 backwards is 48932387955884961
- 16948855978323984 is a
Harshad number . - The number of decimal digits it has is: 17
- The sum of 16948855978323984's digits is 99
- 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 16948855978323984 - Facts about the integer". Numbermatics.com. 2024. Web. 5 June 2024.
APA style:
Numbermatics. (2024). Number 16948855978323984 - Facts about the integer. Retrieved 5 June 2024, from https://numbermatics.com/n/16948855978323984/
Chicago style:
Numbermatics. 2024. "Number 16948855978323984 - Facts about the integer". https://numbermatics.com/n/16948855978323984/
The information we have on file for 16948855978323984 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 16948855978323984, math, Factors of 16948855978323984, curriculum, school, college, exams, university, Prime factorization of 16948855978323984, STEM, science, technology, engineering, physics, economics, calculator, sixteen quadrillion, nine hundred forty-eight trillion, eight hundred fifty-five billion, nine hundred seventy-eight million, three hundred twenty-three thousand, nine hundred eighty-four.