208522667983829940
208,522,667,983,829,940 is an even composite number composed of eight prime numbers multiplied together.
What does the number 208522667983829940 look like?
This visualization shows the relationship between its 8 prime factors (large circles) and 1944 divisors.
208522667983829940 is an even composite number. It is composed of eight distinct prime numbers multiplied together. It has a total of one thousand, nine hundred forty-four divisors.
Prime factorization of 208522667983829940:
22 × 32 × 5 × 13 × 312 × 61 × 1272 × 3072
(2 × 2 × 3 × 3 × 5 × 13 × 31 × 31 × 61 × 127 × 127 × 307 × 307)See below for interesting mathematical facts about the number 208522667983829940 from the Numbermatics database.
Names of 208522667983829940
- Cardinal: 208522667983829940 can be written as Two hundred eight quadrillion, five hundred twenty-two trillion, six hundred sixty-seven billion, nine hundred eighty-three million, eight hundred twenty-nine thousand, nine hundred forty.
Scientific notation
- Scientific notation: 2.0852266798382994 × 1017
Factors of 208522667983829940
Divisors of 208522667983829940
- Number of divisors d(n): 1944
-
Complete list of divisors:
1 2 3 4 5 6 9 10 12 13 15 18 20 26 30 31 36 39 45 52 60 61 62 65 78 90 93 117 122 124 127 130 155 156 180 183 186 195 234 244 254 260 279 305 307 310 366 372 381 390 403 465 468 508 549 558 585 610 614 620 635 732 762 780 793 806 915 921 930 961 1098 1116 1143 1170 1209 1220 1228 1270 1395 1524 1535 1586 1612 1651 1830 1842 1860 1891 1905 1922 2015 2196 2286 2340 2379 2418 2540 2745 2763 2790 2883 3070 3172 3302 3627 3660 3684 3782 3810 3844 3937 3965 3991 4030 4572 4605 4758 4805 4836 4953 5490 5526 5580 5673 5715 5766 6045 6140 6604 7137 7254 7564 7620 7747 7874 7930 7982 8060 8255 8649 9210 9455 9516 9517 9610 9906 10980 11052 11346 11430 11532 11811 11895 11973 12090 12493 13815 14274 14415 14508 14859 15494 15748 15860 15964 16129 16510 17019 17298 18135 18420 18727 18910 19034 19220 19685 19812 19955 22692 22860 23241 23622 23790 23946 24180 24583 24765 24986 27630 28365 28548 28551 28830 29718 30988 32258 33020 34038 34596 35433 35685 35919 36270 37454 37479 37820 38068 38735 38989 39370 39910 43245 46482 47244 47580 47585 47892 48387 49166 49530 49972 51181 55260 56181 56730 57102 57660 58621 59055 59436 59865 62465 64516 68076 69723 70866 71370 71838 72540 73749 74295 74908 74958 77470 77978 78740 79820 80645 85095 85653 86490 92964 93635 94249 95170 96774 98332 99060 100711 102362 112362 112437 113460 114204 116205 116967 117242 118110 119730 122047 122915 123721 124930 139446 141732 142740 142755 143676 145161 147498 148590 149916 153543 154940 155956 161290 168543 170190 171306 172980 175863 177165 179595 187270 187395 188498 190340 193548 194945 201422 204724 209677 221247 224724 224874 232410 233934 234484 236220 239460 240157 241935 243451 244094 245830 247442 249860 255905 278892 280905 282747 285510 290322 293105 294996 295027 297180 302133 307086 322580 337086 340380 342612 348615 350901 351726 354330 359190 366141 368745 371163 374540 374790 376996 389890 402844 419354 428265 442494 449748 460629 464820 467868 471245 480314 483870 486902 488188 491660 494884 499999 503555 506857 511810 527589 561810 562185 565494 571020 580537 580644 584835 586210 590054 604266 610235 614172 618605 629031 674172 697230 701802 703452 708660 718380 720471 725805 730353 732282 737490 742326 749580 762073 767715 779780 838708 842715 848241 856530 879315 884988 885081 906399 921258 942490 960628 967740 973804 983869 999998 1007110 1013714 1023620 1048385 1055178 1098423 1106235 1113489 1123620 1124370 1130988 1161074 1169670 1172420 1180108 1200785 1208532 1208659 1217255 1220470 1225237 1237210 1258062 1394460 1403604 1413735 1440942 1451610 1460706 1464564 1474980 1475135 1484652 1499997 1510665 1520571 1524146 1535430 1586611 1685430 1696482 1713060 1741611 1754505 1758630 1770162 1812798 1830705 1842516 1855815 1884980 1887093 1967738 1999996 2014220 2027428 2096770 2110356 2161413 2191059 2196846 2212470 2226978 2248740 2286219 2303145 2322148 2339340 2378329 2401570 2417318 2434510 2440940 2450474 2474420 2499995 2516124 2534285 2637945 2655243 2827470 2881884 2902685 2903220 2921412 2921719 2950270 2951607 2999994 3021330 3041142 3048292 3070860 3122041 3145155 3173222 3370860 3392964 3483222 3509010 3517260 3540324 3602355 3625596 3625977 3651765 3661410 3675711 3711630 3774186 3810365 3835351 3935476 4193540 4241205 4322826 4382118 4393692 4424940 4425405 4453956 4499991 4531995 4561713 4572438 4606290 4756658 4759833 4803140 4834636 4869020 4900948 4919345 4951603 4999990 5068570 5224833 5275890 5310486 5492115 5567445 5654940 5749189 5805370 5843438 5900540 5903214 5999988 6042660 6043295 6082284 6126185 6244082 6290310 6346444 6499987 6858657 6966444 7018020 7134987 7204710 7251954 7303530 7322820 7351422 7423260 7444867 7499985 7546981 7548372 7602855 7620730 7670702 7933055 8482410 8645652 8708055 8764236 8765157 8850810 8854821 8999982 9063990 9123426 9144876 9212580 9366123 9435465 9513316 9519666 9838690 9903206 9999980 10137140 10449666 10551780 10620972 10807065 10877931 10955295 10984230 11027133 11134890 11431095 11498378 11506053 11610740 11686876 11806428 11891645 11969623 12086590 12252370 12488164 12580620 12790297 12999974 13276215 13717314 14269974 14279499 14409420 14503908 14607060 14608595 14702844 14758035 14854809 14889734 14999970 15093962 15205710 15241460 15341404 15499969 15610205 15712567 15866110 16964820 17247567 17416110 17530314 17701620 17709642 17996647 17999964 18127980 18129885 18246852 18378555 18732246 18870930 19039332 19176755 19499961 19677380 19806412 20899332 21404961 21614130 21755862 21910590 21968460 22054266 22269780 22334601 22499955 22640943 22808565 22862190 22996756 23012106 23783290 23799165 23939246 24173180 24504740 24758015 25580594 25999948 26124165 26295471 26552430 27434628 28098369 28539948 28558998 28745945 29217190 29516070 29709618 29779468 29999940 30187924 30411420 30499939 30918277 30999938 31220410 31425134 31732220 32499935 34293285 34495134 34518159 34832220 35060628 35419284 35674935 35908869 35993294 36259770 36757110 37224335 37464492 37468429 37734905 37741860 37982347 38353510 38370891 38999922 42809922 43228260 43511724 43821180 43825785 44108532 44274105 44564427 44669202 44999910 45281886 45617130 45724380 46024212 46499907 46830615 47137701 47566580 47598330 47878492 49516030 51161188 51742701 52248330 52590942 53104860 53989941 54389655 55135665 56196738 57117996 57491890 57530265 58434380 58499883 59032140 59419236 59848115 60999878 61836554 61999876 62440820 62850268 63951485 64370839 64999870 67003803 67922829 68586570 68990268 69036318 71349870 71397495 71817738 71986588 72519540 73514220 73728199 74274045 74448670 74739457 74936858 75469810 75964694 76707020 76741782 77499845 77999844 78562835 85619844 86237835 87651570 88548210 89128854 89338404 89983235 89999820 90563772 90573289 91234260 91499817 92754831 92999814 93661230 94275402 95196660 96783271 97499805 99032060 103485402 104496660 105181884 107024805 107726607 107979882 108779310 110271330 111673005 112393476 112405287 113204715 113947041 114983780 115060530 115112673 116999766 119696230 121999756 123673108 127902970 128741678 129999740 131477355 134007606 135845658 137173140 138072636 139499721 140491845 141413103 142699740 142794990 143635476 147456398 148548090 148897340 149478914 149873716 150939620 151929388 152499695 153483564 153499693 154591385 154999690 155605099 157125670 161969823 172475670 172590795 175303140 177096420 178224859 178257708 179544345 179966470 181146578 182999634 185509662 185999628 187322460 187342145 188550804 189911735 191854455 193112517 193566542 194999610 201499597 206970804 214049610 215453214 215959764 217558620 220542660 221184597 222822135 223346010 224218371 224810574 226409430 227894082 230121060 230225346 232499535 233956411 233999532 235688505 239392460 255805940 257483356 258713505 262954710 268015212 269949705 271691316 271719867 274499451 278264493 278999442 280983690 282826206 285589980 290349813 292499415 294912796 297096180 298957828 302047783 304999390 306999386 309182770 309999380 311210198 314251340 321854195 323939646 335019015 337215861 339614145 341841123 344951340 345181590 356449718 359088690 359932940 362293156 365999268 368640995 371019324 371058313 373697285 374684290 379823470 383708910 386225034 387133084 389999220 396499207 402999194 428099220 430906428 442369194 445644270 446692020 448436742 449621148 452818860 452866445 455788164 457499085 460450692 460499079 463774155 464999070 466815297 467912822 471377010 483916355 487089577 517427010 525909420 534674577 538633035 539899410 543439734 548998902 556528986 557998884 561967380 562026435 565652412 569735205 575563365 579337551 580699626 584998830 604095566 604498791 609998780 613998772 618365540 622420396 643708390 647879292 663553791 670038030 672655113 674431722 679228290 683682246 690363180 697498605 701869233 707065515 712899436 718177380 730147003 737281990 742116626 747394570 749368580 759646940 767417820 767498465 772450068 778025495 792998414 805998388 809849115 815159601 871049439 884738388 891124295 891288540 896873484 905732890 906143349 914998170 920998158 927548310 929998140 933630594 935825644 942754020 945498109 958466587 965562585 967832710 974179154 1007497985 1034854020 1069349154 1077266070 1079798820 1086879468 1097997804 1105922985 1113057972 1113174939 1121091855 1124052870 1139470410 1151126730 1158675102 1161399252 1169782055 1169997660 1177452757 1189497621 1208191132 1208997582 1287416780 1327107582 1340076060 1345310226 1348863444 1358456580 1358599335 1367364492 1372497255 1381497237 1391322465 1394997210 1400445891 1403738466 1414131030 1451749065 1460294006 1461268731 1474563980 1484233252 1494789140 1510238915 1520142121 1534996930 1556050990 1585996828 1604023731 1619698230 1630319202 1686079305 1709205615 1742098878 1782248590 1811465780 1812286698 1813496373 1829996340 1841996316 1855096620 1855291565 1867261188 1890996218 1916933174 1931125170 1935665420 1948358308 1982496035 1995496009 2014995970 2105607699 2138698308 2154532140 2190441009 2211845970 2226349878 2242183710 2248105740 2278940820 2285574169 2302253460 2302495395 2316923167 2317350204 2334076485 2339564110 2354905514 2378995242 2417995164 2435447885 2654215164 2673372885 2690620452 2717198670 2718430047 2744994510 2762994474 2782644930 2789994420 2800891782 2807476932 2828262060 2836494327 2875399761 2896687755 2903498130 2920588012 2922537462 3020477830 3022493955 3040284242 3069993860 3112101980 3208047462 3239396460 3260638404 3317768955 3339524817 3363275565 3372158610 3418411230 3484197756 3509346165 3532358271 3564497180 3568492863 3624573396 3626992746 3650735015 3710583130 3781992436 3833866348 3862250340 3926621179 3964992070 3990992018 4029991940 4075798005 4211215398 4355247195 4380882018 4383806193 4423691940 4452699756 4484367420 4530716745 4560426363 4571148338 4604990790 4633846334 4668152970 4679128220 4709811028 4727490545 4757990484 4758490483 4792332935 4823758069 4870895770 5346745770 5434397340 5436860094 5489989020 5524970629 5525988948 5565289860 5565874695 5601783564 5672988654 5750799522 5793375510 5806996260 5845074924 5887263785 5947488105 5986488027 6040955660 6044987910 6080568484 6416094924 6571323027 6635537910 6679049634 6726551130 6744317220 6836822460 6856722507 6907486185 6950769501 7002229455 7018692330 7064716542 7136985726 7253985492 7301470030 7306343655 7421166260 7600710605 7853242358 7929984140 7981984036 8020118655 8151596010 8422430796 8509482981 8626199283 8710494390 8761764036 8767612386 9061433490 9067481865 9120852726 9142296676 9209981580 9267692668 9336305940 9363481273 9454981090 9491911039 9516980966 9584665870 9647516138 9741791540 9977480045 10528038495 10597074813 10693491540 10873720188 10952205045 11049941258 11131749390 11345977308 11427870845 11501599044 11502807703 11584615835 11586751020 11774527570 11779863537 11894976210 11972976054 12089975820 12291475417 13142646054 13271075820 13358099268 13453102260 13592150235 13681279089 13713445014 13814972370 13901539002 14004458910 14037384660 14129433084 14182471635 14273971452 14275471449 14376998805 14471274207 14602940060 14612687310 15201421210 15706484716 16040237310 16303192020 16574911887 16697624085 17018965962 17252398566 17420988780 17535224772 17661791355 17842464315 17959464081 18122866980 18134963730 18241705452 18726962546 18909962180 18983822078 19033961932 19169331740 19295032276 19633105895 19761847573 19954960090 20570167521 20852308503 21056076990 21194149626 21904410090 21919030965 22099882516 22263498780 22634557093 22802131815 22855741690 23005615406 23169231670 23549055140 23559727074 23789952420 23792452415 23945952108 24118790345 24582950834 26285292108 27184300470 27362558178 27426890028 27624853145 27629944740 27803078004 28008917820 28090443819 28364943270 28475733117 28550942898 28753997610 28942548414 29225374620 29712464197 29932440135 30402842420 32080474620 32856615135 33149823774 33395248170 34037931924 34283612535 34504797132 34508423109 34753847505 35323582710 35339590611 35684928630 35918928162 36269927460 36874426251 37453925092 37967644156 39266211790 39523695146 39909920180 41140335042 41704617006 42112153980 42388299252 42547414905 42826414347 43130996415 43413822621 43808820180 43838061930 45269114186 45604263630 45711483380 46011230812 46338463340 46817406365 47119454148 47124405751 47459555195 47584904830 48237580690 49165901668 49724735661 52985374065 54368600940 54725116356 55249706290 56180887638 56729886540 56951466234 57101885796 57507995220 57514038515 57885096828 58899317685 59285542719 59424928394 59864880270 61457377085 61860376279 65713230270 66299647548 66790496340 67903671279 68406395445 68567225070 69016846218 69507695010 70647165420 70679181222 71369857260 71377357245 71824618177 71837856324 72356371035 73748852502 78532423580 79047390292 82280670084 82874559435 83409234012 84271331457 85094829810 85427199351 85652828694 86261992830 86827645242 87676123860 89137392591 89797320405 90538228372 91208527260 92728669381 93634812730 94248811502 94919110390 95169809660 96475161380 98809237865 99449471322 102850837605 103525269327 104261542515 105970748130 110499412580 110623278753 112361775276 113172785465 113902932468 115028077030 117798635370 118571085438 118849856788 119729760540 121725256549 122914754170 123720752558 131426460540 135807342558 136812790890 137134450140 138033692436 139015390020 140452219095 141358362444 141373217253 142378665585 142754714490 143649236354 144712742070 147497705004 148562320985 149536500139 165749118870 168542662914 170189659620 170854398702 171305657388 172523985660 172542115545 173655290484 176697953055 177856628157 178274785182 179594640810 184372131255 185457338762 185581128837 187269625460 188497623004 189838220780 197618475730 198898942644 203711013837 205701675210 207050538654 208523085030 211941496260 214132071735 215473854531 217069113105 221246557506 226345570930 230056154060 235597270740 235622028755 237142170876 243450513098 245829508340 247441505116 248623678305 267412177773 271614685116 273625581780 278186008143 280904438190 282746434506 284757331170 285509428980 287298472708 289425484140 290267919463 294249242209 296427713595 297124641970 299073000278 309301881395 331498237740 337085325828 339518356395 341708797404 345084231090 353395906110 355713256314 356549570364 359123090885 359189281620 365175769647 368744262510 370914677524 371162257674 395236951460 407422027674 411403350420 414101077308 417046170060 421356657285 424119651759 427135996755 428264143470 430947709062 434138226210 442493115012 445686962955 448609500417 452691141860 463643346905 471244057510 486901026196 497247356610 517626346635 534824355546 553116393765 556372016286 556743386511 561808876380 565492869012 569514662340 580535838926 588498484418 592855427190 594249283940 598146000556 608626282745 612617274763 618603762790 646421563593 679036712790 690168462180 701671269883 706791812220 706866086265 711426512628 718246181770 730351539294 737488525020 742324515348 747682500695 814844055348 834558024429 842713314570 848239303518 854271993510 856528286940 861895418124 868276452420 870803758389 882747726627 889283140785 891373925910 897219000834 927286693810 927905644185 942488115020 994494713220 1018555069185 1035252693270 1069648711092 1077369272655 1095527308941 1106232787530 1112744032572 1113486773022 1161071677852 1176996968836 1185710854380 1205472701953 1217252565490 1225234549526 1237207525580 1292843127186 1337060888865 1345828501251 1358073425580 1390930040715 1403342539766 1413732172530 1436492363540 1451339597315 1460703078588 1460856578281 1471246211045 1495365001390 1669116048858 1685426629140 1696478607036 1708543987020 1741607516778 1765495453254 1778566281570 1782747851820 1794438001668 1825878848235 1837851824289 1854573387620 1855811288370 2037110138370 2070505386540 2105013809649 2120598258795 2154738545310 2191054617882 2212465575060 2226973546044 2243047502085 2410945403906 2434505130980 2450469099052 2585686254372 2612411275167 2648243179881 2674121777730 2691657002502 2781860081430 2783716932555 2806685079532 2827464345060 2874588750811 2902679194630 2921713156562 2942492422090 2990730002780 3063086373815 3232107817965 3338232097716 3483215033556 3508356349415 3530990906508 3557132563140 3616418105859 3651757696470 3675703648578 3711622576740 3773482953019 4074220276740 4172790122145 4210027619298 4241196517590 4309477090620 4354018791945 4382109235764 4382569734843 4413738633135 4486095004170 4821890807812 5224822550334 5296486359762 5348243555460 5383314005004 5477636544705 5513555472867 5563720162860 5567433865110 5749177501622 5805358389260 5843426313124 5884984844180 6027363509765 6126172747630 6315041428947 6464215635930 6729142506255 7016712698830 7232836211718 7303515392940 7304282891405 7351407297156 7546965906038 8345580244290 8420055238596 8482393035180 8623766252433 8708037583890 8765139469686 8827477266270 8972190008340 9121726508479 9189259121445 10449645100668 10525069048245 10592972719524 10849254317577 10955273089410 11027110945734 11134867730220 11320448859057 11498355003244 12054727019530 12252345495260 12630082857894 12928431271860 13062056375835 13147709204529 13241215899405 13458285012510 14033425397660 14372943754055 14465672423436 14608565782810 15093931812076 16691160488580 17247532504866 17416075167780 17530278939372 17654954532540 18082090529295 18243453016958 18378518242890 18867414765095 18991135517653 21050138096490 21698508635154 21910546178820 21912848674215 22054221891468 22640897718114 24109454039060 25260165715788 25871298757299 26124112751670 26295418409058 26482431798810 26916570025020 27365179525437 27567777364335 28745887508110 29217131565620 31575207144735 33961346577171 34495065009732 36164181058590 36486906033916 36757036485780 37369653760543 37734829530190 37982271035306 42100276192980 43118831262165 43397017270308 43825697348430 45281795436228 45608632542395 51742597514598 52248225503340 52590836818116 52964863597620 54246271587885 54730359050874 55135554728670 56602244295285 56973406552959 57491775016220 63150414289470 65738546022645 67922693154342 72328362117180 74739307521086 75469659060380 75964542070612 82095538576311 86237662524330 87651394696860 89112251275141 91217265084790 94955677588265 103485195029196 108492543175770 109460718101748 110271109457340 112108961281629 113204488590570 113946813105918 126300828578940 129356493786495 131477092045290 135845386308684 136825897627185 149478615042172 164191077152622 169806732885855 170920219658877 172475325048660 178224502550282 182434530169580 186848268802715 189911355176530 216985086351540 224217922563258 226408977181140 227893626211836 258712987572990 262954184090580 267336753825423 273651795254370 284867032764795 328382154305244 336326883844887 339613465771710 341840439317754 356449005100564 373696537605430 379822710353060 410477692881555 445561256375705 448435845126516 517425975145980 534673507650846 547303590508740 560544806408145 569734065529590 672653767689774 679226931543420 683680878635508 747393075210860 802010261476269 820955385763110 854601098294385 891122512751410 1069347015301692 1121089612816290 1139468131059180 1158459266576833 1336683769127115 1345307535379548 1604020522952538 1641910771526220 1681634419224435 1709202196588770 1782245025502820 2242179225632580 2316918533153666 2673367538254230 3208041045905076 3363268838448870 3418404393177540 3475377799730499 4010051307381345 4633837066307332 5346735076508460 5792296332884165 6726537676897740 6950755599460998 8020102614762690 10426133399191497 11584592665768330 13901511198921996 16040205229525380 17376888998652495 20852266798382994 23169185331536660 34753777997304990 41704533596765988 52130666995957485 69507555994609980 104261333991914970 208522667983829940
- Sum of all divisors σ(n): 723428654806317096
- Sum of proper divisors (its aliquot sum) s(n): 514905986822487156
- 208522667983829940 is an abundant number, because the sum of its proper divisors (514905986822487156) is greater than itself. Its abundance is 306383318838657216
Bases of 208522667983829940
- Binary: 10111001001101001001000011000000001100101011111011101101002
- Hexadecimal: 0x2E4D24300CAFBB4
- Base-36: 1L17477XTXH0
Squares and roots of 208522667983829940
- 208522667983829940 squared (2085226679838299402) is 43481703063094575894421310840403600
- 208522667983829940 cubed (2085226679838299403) is 9066920731197151554400794974610934607236823363784000
-
The
square root of 208522667983829940 is 456642823.2041208157 -
The
cube root of 208522667983829940 is 592995.0812133577
Scales and comparisons
How big is 208522667983829940?- 208,522,667,983,829,940 seconds is equal to 6,630,375,838 years, 48 weeks, 9 hours, 39 minutes.
-
To count from 1 to 208,522,667,983,829,940 would take you about nineteen billion, eight hundred ninety-one million, one hundred twenty-seven thousand, five hundred sixteen 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 208522667983829940 cubic inches would be around 49416.3 feet tall.
Recreational maths with 208522667983829940
- 208522667983829940 backwards is 049928389766225802
- 208522667983829940 is a
Harshad number . - The number of decimal digits it has is: 18
- The sum of 208522667983829940's digits is 90
- 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 208522667983829940 - Facts about the integer". Numbermatics.com. 2024. Web. 16 June 2024.
APA style:
Numbermatics. (2024). Number 208522667983829940 - Facts about the integer. Retrieved 16 June 2024, from https://numbermatics.com/n/208522667983829940/
Chicago style:
Numbermatics. 2024. "Number 208522667983829940 - Facts about the integer". https://numbermatics.com/n/208522667983829940/
The information we have on file for 208522667983829940 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 208522667983829940, math, Factors of 208522667983829940, curriculum, school, college, exams, university, Prime factorization of 208522667983829940, STEM, science, technology, engineering, physics, economics, calculator, two hundred eight quadrillion, five hundred twenty-two trillion, six hundred sixty-seven billion, nine hundred eighty-three million, eight hundred twenty-nine thousand, nine hundred forty.