1018608953675625
1,018,608,953,675,625 is an odd composite number composed of eight prime numbers multiplied together.
1018608953675625 is an odd composite number. It is composed of eight distinct prime numbers multiplied together. It has a total of two thousand, one hundred sixty divisors.
Prime factorization of 1018608953675625:
32 × 54 × 13 × 172 × 192 × 31 × 59 × 73
(3 × 3 × 5 × 5 × 5 × 5 × 13 × 17 × 17 × 19 × 19 × 31 × 59 × 73)See below for interesting mathematical facts about the number 1018608953675625 from the Numbermatics database.
Names of 1018608953675625
- Cardinal: 1018608953675625 can be written as One quadrillion, eighteen trillion, six hundred eight billion, nine hundred fifty-three million, six hundred seventy-five thousand, six hundred twenty-five.
Scientific notation
- Scientific notation: 1.018608953675625 × 1015
Factors of 1018608953675625
Divisors of 1018608953675625
- Number of divisors d(n): 2160
-
Complete list of divisors:
1 3 5 9 13 15 17 19 25 31 39 45 51 57 59 65 73 75 85 93 95 117 125 153 155 171 177 195 219 221 225 247 255 279 285 289 295 323 325 361 365 375 403 425 465 475 527 531 585 589 625 657 663 741 765 767 775 855 867 885 949 969 975 1003 1083 1095 1105 1121 1125 1209 1235 1241 1275 1387 1395 1425 1445 1475 1581 1615 1625 1767 1805 1825 1829 1875 1989 2015 2125 2223 2263 2301 2325 2375 2601 2635 2655 2847 2907 2925 2945 3009 3249 3285 3315 3363 3627 3705 3723 3757 3825 3835 3875 4161 4199 4275 4307 4335 4425 4693 4743 4745 4845 4875 5015 5301 5415 5475 5487 5491 5525 5605 5625 6045 6137 6175 6205 6375 6789 6851 6903 6935 6975 7125 7225 7375 7657 7905 8075 8125 8541 8835 8959 9025 9027 9125 9145 9945 10013 10075 10089 10625 11115 11169 11191 11271 11315 11505 11625 11875 12483 12597 12921 13005 13039 13175 13275 14079 14235 14535 14573 14625 14725 15045 16133 16245 16425 16461 16473 16575 16815 17051 18031 18135 18411 18525 18615 18785 19057 19125 19175 19375 20367 20553 20805 20995 21097 21299 21375 21535 21675 22125 22971 23465 23579 23715 23725 23777 24225 24375 25075 26353 26505 26877 27075 27375 27435 27455 27625 28025 29419 30039 30225 30685 30875 31025 31093 31875 33573 33813 33945 34255 34515 34675 34751 34875 35625 36125 36875 37791 38285 38471 38763 39117 39525 40375 42237 42705 42997 43719 44175 44795 45125 45135 45625 45725 48399 49419 49725 50065 50375 50445 51153 54093 55233 55575 55845 55955 55991 56355 56575 57171 57525 58125 61659 62415 62985 63291 63897 64605 65025 65195 65875 66375 68913 70395 70737 71175 71331 71383 72675 72865 73125 73219 73625 75225 79059 79781 80631 80665 81225 81833 82125 82305 82365 82875 84075 85255 88257 90117 90155 90675 92055 92625 93075 93279 93925 95285 95625 95875 100719 101835 102765 104025 104253 104329 104975 105485 106495 106875 107675 108375 110625 114855 115413 116467 117325 117351 117895 118575 118625 118885 121125 125375 128991 130169 131157 131765 132525 133517 134385 135375 136875 137175 137275 138125 140125 145197 145483 147095 150195 151125 153425 153459 154375 155125 155465 162279 167865 167973 169065 169725 170221 171275 171513 172575 173375 173755 174375 180625 188955 189873 190247 191425 191691 192355 193815 195585 197625 201875 211185 212211 213525 213993 214149 214985 218595 219657 220875 221663 223975 225625 225675 228625 237177 239343 241995 245499 247095 247741 248625 250325 251875 252225 255765 264771 270465 274261 276165 276887 277875 279225 279775 279837 279955 281775 282875 285855 287625 306527 308295 312075 312759 312987 314925 316455 319485 323025 323969 325125 325975 329375 331875 342589 344565 346239 349401 351975 353685 355875 356655 356915 362083 363375 364325 366095 368125 376125 386973 390507 395295 398905 400551 400843 403155 403325 404209 406125 409165 410625 411525 411825 414375 420375 426275 436449 441285 448001 450585 450775 451763 453375 460275 463125 465375 466395 469625 476425 479375 500123 503595 503919 509175 510663 513825 520125 521265 521645 524875 527425 528581 532475 538375 541875 558961 570741 574275 577065 582335 586625 586755 589475 590767 592875 593125 594425 605625 626875 642447 644955 650845 654007 655785 658825 658971 660269 662625 664989 667585 671925 676875 685875 686375 700625 718029 725985 727415 730949 735475 736497 743223 750975 755625 767125 767295 775625 777325 811395 816943 822783 830661 839325 839865 845325 848625 851105 856375 857565 862875 866875 868775 919581 938961 944775 949365 951235 951847 957125 958455 961775 969075 971907 977925 988125 1027767 1048203 1055925 1061055 1063829 1067625 1069965 1070745 1074925 1086249 1092975 1098285 1104375 1108315 1119875 1128375 1143125 1171521 1185885 1196715 1201653 1202529 1209975 1212627 1227495 1235475 1238705 1243125 1244723 1251625 1261125 1278825 1309347 1323855 1344003 1352325 1355289 1356277 1371305 1380825 1384435 1389375 1391161 1396125 1398875 1399185 1399775 1408875 1414375 1429275 1438125 1500369 1531989 1532635 1541475 1554827 1560375 1563795 1564935 1574625 1582275 1585743 1597425 1615125 1619845 1625625 1629875 1676883 1712223 1712945 1722825 1731195 1735721 1747005 1759875 1768425 1772301 1779375 1783275 1784575 1810415 1816875 1821625 1830475 1880625 1934865 1952535 1962021 1976475 1980807 1994525 1994967 2002755 2004215 2015775 2016625 2021045 2030625 2045825 2057625 2059125 2101875 2131375 2182245 2192847 2206425 2212873 2229669 2240005 2252925 2253875 2258815 2266875 2269789 2301375 2326875 2331975 2348125 2382125 2450829 2468349 2473211 2491983 2500615 2517975 2519595 2536823 2545875 2553315 2569125 2600625 2606325 2608225 2624375 2637125 2642905 2662375 2691875 2758743 2794805 2853705 2855541 2871375 2885325 2911675 2915721 2933125 2933775 2947375 2953835 2964375 2972125 3083301 3191487 3212235 3224775 3234199 3254225 3258747 3270035 3278925 3294125 3294855 3301345 3313125 3324945 3337925 3359625 3429375 3431875 3590145 3607587 3629925 3637075 3637881 3654745 3677375 3682485 3716115 3734169 3754875 3835625 3836475 3886625 4032009 4056975 4065867 4068831 4084715 4113915 4153305 4173483 4196625 4199325 4211597 4226625 4243125 4255525 4281875 4287825 4314375 4343875 4501107 4597905 4664481 4694805 4707079 4723875 4746825 4756175 4757229 4759235 4785625 4792275 4808875 4845375 4859535 4889625 5030649 5138835 5207163 5210959 5241015 5279625 5305275 5316903 5319145 5338125 5349825 5353725 5374625 5431245 5464875 5491425 5541575 5599375 5641875 5824013 5857605 5886063 5929425 5942421 5983575 6008265 6012645 6049875 6063135 6137475 6155411 6177375 6193525 6223615 6258125 6305625 6394125 6546735 6578541 6619275 6638619 6720015 6761625 6776445 6781385 6809367 6856525 6871553 6904125 6922175 6955805 6980625 6994375 6995925 6998875 7044375 7146375 7352487 7419633 7501845 7610469 7616017 7659945 7663175 7679971 7707375 7774135 7801875 7818975 7824675 7873125 7911375 7928715 7987125 8075625 8099225 8149375 8384415 8502091 8561115 8564725 8566623 8583497 8614125 8655975 8678605 8735025 8799375 8842125 8861505 8916375 8922875 9052075 9108125 9152375 9502337 9574461 9674325 9702597 9762675 9810105 9882375 9904035 9972625 9974835 10013775 10021075 10043039 10078875 10083125 10105225 10229125 10288125 10295625 10620259 10656875 10911225 10964235 11032125 11064365 11148345 11200025 11202507 11224573 11264625 11269375 11294075 11348945 11506875 11659875 11910625 12206493 12254145 12341745 12366055 12426133 12459915 12503075 12520449 12589875 12597975 12634791 12684115 12729375 12766575 12845625 13031625 13041125 13185625 13214525 13311875 13793715 13888031 13974025 13993443 14121237 14268525 14277705 14356875 14426625 14558375 14578605 14668875 14736875 14769175 14860625 15416505 15621489 15632877 15957435 16061175 16123875 16170995 16181399 16271125 16293735 16350175 16394625 16470625 16474275 16506725 16624725 16689625 16798125 17472039 17950725 18037935 18085093 18149625 18185375 18189405 18273725 18386875 18412425 18466233 18580575 18670845 18774375 19182375 19433125 19915857 20160045 20212751 20284875 20329335 20344155 20423575 20428101 20569575 20614659 20766525 20867415 20983125 20996625 21057985 21133125 21277625 21439125 21719375 22258899 22505535 22831407 22848051 22989525 23039913 23322405 23474025 23535395 23619375 23649737 23734125 23780875 23786145 23796175 23961375 24044375 24226875 24297675 24448125 25153245 25506273 25694175 25750491 26035815 26054795 26205075 26398125 26432059 26526375 26584515 26595725 26749125 26768625 26873125 27156225 27324375 27457125 27707875 28507011 29107791 29120065 29288025 29430315 29507257 29647125 29712105 29917875 30041325 30063225 30129117 30249375 30315675 30687375 30777055 30886875 30967625 31118075 31860777 31970625 32733675 32892705 32978699 33096375 33193095 33600075 33673719 33808125 33882225 33906925 34046835 34282625 34357765 34520625 34610875 34779025 34979625 34994375 35731875 36762435 37098165 37278399 37509225 37904373 38052345 38080085 38299725 38315875 38399855 38536875 38586413 38870675 39094875 39123375 39556875 39643575 39935625 40496125 41664093 41922075 42044587 42363711 42510455 42805575 42823625 42833115 42917485 43070625 43125991 43279875 43393025 43675125 44210625 44307525 44581875 44614375 45260375 45761875 46898631 47511685 47872305 48199637 48371625 48512985 48544197 48813375 49050525 49411875 49520175 49863125 49874175 50068875 50105375 50215195 50394375 50526125 51145625 52416117 53101295 54255279 54556125 54821175 55160625 55321825 55398699 55741725 56000125 56012535 56122865 56323125 56470375 56744725 58299375 60638253 61032465 61270725 61708725 61830275 61843977 62130665 62299575 62515375 62602245 62949375 62989875 63173955 63420575 63832875 65158125 65205625 66072625 68544153 68968575 69119739 69440155 69870125 69967215 70606185 70949211 71342625 71388525 72133125 72791875 72893025 73344375 73845875 76518819 77082525 77251473 78107445 78164385 79296177 79787175 80020343 80305875 80619375 80854975 80906995 81355625 81468675 81750875 81973125 82371375 82533625 83123625 83448125 85521033 87360195 88521771 89753625 90189675 90387351 90425465 90748125 90926875 90947025 91368625 92062125 92331165 92902875 93354225 95582331 95911875 98936097 99008221 99579285 100800225 101021157 101063755 101424375 101646675 101720775 102117875 102140505 102847875 103073295 103832625 104337075 104983125 105289925 106388125 107195625 111294495 111835197 112527675 114157035 114240255 114947625 115199565 115759239 116612025 117370125 117676975 118248685 118670625 118904375 118930725 118980875 119806875 121488375 124992279 125766225 126133761 127531365 128470875 128752455 129377973 130179075 130273975 130559507 131025375 132160295 132631875 132922575 132978625 133745625 133843125 135781125 137285625 138539375 142535055 144598911 145538955 145600325 145632591 145919449 146440125 147151575 147536285 148235625 148560525 149589375 150206625 150316125 150645585 151578375 153436875 153885275 154838125 155590375 159303885 161539729 162765837 163668375 164463525 164893495 165481875 165965475 168000375 168368595 169411125 169534625 170234175 171413125 171788825 173054375 173895125 174898125 180544403 181914759 183812175 185490825 186391995 187546125 189521865 190261725 190400425 190817741 191498625 191579375 191999275 192932065 194353375 195474375 195616875 198217875 202480625 208320465 209610375 210222935 211818555 212552275 212847633 214027875 214118125 214165575 214587425 215629955 216399375 216965125 218375625 221537625 226301875 234493155 236096527 237558425 237888531 239361525 240061029 240998185 241858125 242564925 242720985 244066875 245252625 247600875 249370875 250344375 250526875 251075975 252630625 262080585 265506475 265565313 271276395 272780625 274105875 276609125 276993495 278708625 280000625 280062675 280614325 282351875 283723625 296808291 297024663 303191265 305162325 306353625 307446581 308543625 309151375 309219885 310653325 311497875 312576875 313011225 314949375 315869775 317102875 319164375 330363125 342720765 343616767 344842875 345598695 347200775 347277717 349350625 349836075 353030925 354746055 356713125 356942625 364465125 369229375 378401283 382594095 385412625 386257365 388133919 390537225 390821925 391678521 396480885 398935875 400101715 401529375 404274875 404534975 407343375 408754375 411856875 412668125 415618125 427605165 433796733 436800975 437758347 442608855 448768125 449345003 450948375 451936755 452127325 454735125 456843125 460310625 461655825 464514375 466771125 477911655 484619187 494680485 495041105 497896425 501623369 504001125 505105785 505318775 508233375 508603875 510589375 510702525 514239375 515366475 519163125 521685375 526449625 541633209 556472475 559175985 560637883 562638375 570785175 571201275 572453223 574738125 575997825 578796195 583060125 586850625 588384875 591243425 594653625 594904375 607441875 624961395 626595281 628831125 630668805 637656825 642354375 643762275 646889865 650895375 651369875 652797535 655126875 660801475 664612875 664893125 678905625 708289581 712675275 720183087 722994555 727694775 728001625 728162955 729597245 732200625 733141847 735757875 737681425 742802625 751033125 751580625 753227925 757891875 769426375 777951875 796519425 807698645 813829185 818341875 819393829 822317625 824467475 829827375 840001875 841842975 847055625 847673125 851170875 858944125 869475625 891073989 902722015 909573795 919060875 922339743 927454125 931959975 937730625 947609325 951308625 952002125 954088705 957493125 959996375 964660325 971766875 991089375 1030850301 1041602325 1048051875 1051114675 1059092775 1062761375 1064238165 1070139375 1070827875 1072937125 1078149775 1084825625 1107688125 1172465775 1175035563 1180482635 1187792125 1189442655 1196807625 1200305145 1204990925 1212824625 1213604925 1226263125 1238004375 1246854375 1255379875 1310402925 1313275041 1327532375 1327826565 1348035009 1356381975 1370529375 1383045625 1384967475 1393543125 1400313375 1403071625 1418618125 1453857561 1484041455 1485123315 1504870107 1515956325 1525811625 1531768125 1537232905 1542718125 1545756875 1546099425 1553266625 1557489375 1565056125 1579348875 1585514375 1624899627 1681913649 1713603825 1717359669 1718083835 1724214375 1727993475 1736003875 1736388585 1749180375 1765154625 1773730275 1784713125 1822325625 1879785843 1892006415 1912970475 1927063125 1931286825 1940669595 1952686125 1954109625 1958392605 1982404425 1994679375 2000508575 2021374375 2022674875 2036716875 2124868743 2138025825 2168983665 2184004875 2188791735 2199425541 2213044275 2246725015 2254741875 2259683775 2260636625 2273675625 2308279125 2333855625 2389558275 2423095935 2458181487 2473402425 2475205525 2480630633 2489482125 2508116845 2520005625 2525528925 2526593875 2541166875 2543019375 2553512625 2576832375 2608426875 2632248125 2708166045 2767019229 2782362375 2795879925 2803189415 2813191875 2853925875 2856006375 2862266115 2879989125 2893980975 2915300625 2941924375 2956217125 2973268125 3069254851 3092550903 3124806975 3132976405 3144155625 3153344025 3188284125 3218811375 3234449325 3254476875 3256849375 3263987675 3304007375 3323064375 3541447905 3563376375 3600915435 3614972775 3638473875 3640008125 3640814775 3647986225 3665709235 3678789375 3688407125 3714013125 3766139625 3847131875 3982597125 4038493225 4044105027 4069145925 4096969145 4111588125 4122337375 4149136875 4209214875 4255854375 4294720625 4455369945 4513610075 4514610321 4547868975 4595304375 4611698715 4637270625 4659799875 4738046625 4756543125 4760010625 4770443525 4799981875 4823301625 5045740947 5154251505 5208011625 5255573375 5295463875 5313806875 5321190825 5354139375 5364685625 5390748875 5639357529 5841485039 5862328875 5875177815 5902413175 5938960625 5947213275 5984038125 6001525725 6024954625 6064123125 6068024625 6276899375 6552014625 6566375205 6598276623 6637661875 6639132825 6740175045 6781909875 6924837375 7001566875 7015358125 7269287805 7374544461 7420207275 7425616575 7441891899 7524350535 7579781625 7629058125 7686164525 7730497125 7766333125 7825280625 7896744375 8124498135 8409568245 8568019125 8586798345 8590419175 8639967375 8680019375 8681942925 8745901875 8825773125 8868651375 9207764553 9398929215 9460032075 9530844011 9564852375 9656434125 9703347975 9763430625 9770548125 9791963025 9912022125 10002542875 10113374375 10624343715 10652119777 10690129125 10844918325 10920024375 10943958675 10997127705 11065221375 11233625075 11298418875 11303183125 11541395625 11947791375 12115479675 12290907435 12367012125 12376027625 12403153165 12447410625 12540584225 12627644625 12632969375 12767563125 12884161875 13540830225 13835096145 13911811875 13929695093 13979399625 14015947075 14269629375 14280031875 14311330575 14399945625 14469904875 14781085625 15346274255 15462754515 15624034875 15664882025 15766720125 15941420625 16094056875 16172246625 16319938375 16520036875 17524455117 17707239525 17816881875 18004577175 18074863875 18192369375 18204073875 18239931125 18328546175 18442035625 18830698125 19912985625 20192466125 20220525135 20345729625 20484845725 20611686875 21046074375 22276849725 22325675697 22568050375 22573051605 22739344875 23058493575 23298999375 23690233125 23852217625 24116508125 25228704735 25771257525 26040058125 26277866875 26477319375 26605954125 26953744375 27623293659 28196787645 28592532033 29207425195 29311644375 29375889075 29512065875 29736066375 30007628625 30124773125 30340123125 31956359331 32760073125 32831876025 32991383115 33195664125 33700875225 33909549375 34624186875 36346439025 36872722305 37101036375 37128082875 37209459495 37621752675 37898908125 38430822625 38652485625 40622490675 41789085279 42047841225 42840095625 42933991725 42952095875 43199836875 43409714625 44343256875 46038822765 46994646075 47300160375 47654220055 47824261875 48282170625 48516739875 48959815125 49560110625 50012714375 52573365351 53121718575 53260598885 53450645625 54224591625 54719793375 54985638525 55326106875 56168125375 56492094375 59738956875 60577398375 61454537175 61835060625 61880138125 62015765825 62702921125 63138223125 67704151125 69175480725 69648475465 69896998125 70079735375 71556652875 72349524375 76731371275 77313772575 78120174375 78324410125 78833600625 80861233125 81599691875 85777596099 87622275585 88536197625 90022885875 90374319375 91020369375 91199655625 91642730875 95869077993 100962330625 101102625675 101728648125 102424228625 111384248625 111628378485 112840251875 112865258025 113696724375 115292467875 119261088125 125367255837 126143523675 128856287625 133029770625 138116468295 140983938225 142962660165 146037125975 146879445375 147560329375 148680331875 150038143125 159781796655 164159380125 164956915575 165978320625 168504376125 181086036209 181732195125 184363611525 185505181875 185640414375 186047297475 188108763375 192154113125 203112453375 208945426395 210239206125 214669958625 214760479375 217048573125 230194113825 234973230375 236500801875 238271100275 242583699375 244799075625 262866826755 265608592875 266302994425 271122958125 273598966875 274928192625 280840626875 302886991875 307272685875 310078829125 313514605625 338520755625 345877403625 348242377325 350398676875 357783264375 383656856375 386568862875 391622050625 428887980495 438111377925 442680988125 450114429375 458213654375 479345389965 505513128375 512121143125 543258108627 556921243125 558141892425 564326290125 576462339375 626836279185 630717618375 644281438125 690582341475 704919691125 714813300825 730185629875 734397226875 798908983275 820796900625 824784577875 842521880625 905430181045 908660975625 921818057625 930236487375 940543816875 1015562266875 1044727131975 1051196030625 1073349793125 1150970569125 1174866151875 1191355501375 1314334133775 1328042964375 1331514972125 1374640963125 1536363429375 1550394145625 1629774325881 1729387018125 1741211886625 1918284281875 1932844314375 2144439902475 2190556889625 2396726949825 2527565641875 2716290543135 2790709462125 2821631450625 3134181395925 3153588091875 3452911707375 3524598455625 3574066504125 3650928149375 3994544916375 4123922889375 4527150905225 4609090288125 4651182436875 5223635659875 5754852845625 5956777506875 6571670668875 6657574860625 8148871629405 8706059433125 10722199512375 10952784448125 11983634749125 13581452715675 13953547310625 15670906979625 17264558536875 17870332520625 19972724581875 22635754526125 26118178299375 32858353344375 40744358147025 53610997561875 59918173745625 67907263578375 78354534898125 113178772630625 203721790735125 339536317891875 1018608953675625
- Sum of all divisors σ(n): 2362211184453120
- Sum of proper divisors (its aliquot sum) s(n): 1343602230777495
- 1018608953675625 is an abundant number, because the sum of its proper divisors (1343602230777495) is greater than itself. Its abundance is 324993277101870
Bases of 1018608953675625
- Binary: 111001111001101011011000001101100101001111011010012
- Hexadecimal: 0x39E6B60D94F69
- Base-36: A12EHRBBS9
Squares and roots of 1018608953675625
- 1018608953675625 squared (10186089536756252) is 1037564200508151557197719140625
- 1018608953675625 cubed (10186089536756253) is 1056872184650894638610808203651800010009765625
-
The
square root of 1018608953675625 is 31915653.7403767589 -
The
cube root of 1018608953675625 is 100616.4900459799
Scales and comparisons
How big is 1018608953675625?- 1,018,608,953,675,625 seconds is equal to 32,388,613 years, 50 weeks, 8 hours, 33 minutes, 45 seconds.
-
To count from 1 to 1,018,608,953,675,625 would take you about ninety-seven million, one hundred sixty-five thousand, eight hundred forty-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 1018608953675625 cubic inches would be around 8384.7 feet tall.
Recreational maths with 1018608953675625
- 1018608953675625 backwards is 5265763598068101
- The number of decimal digits it has is: 16
- The sum of 1018608953675625's digits is 72
- 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 1018608953675625 - Facts about the integer". Numbermatics.com. 2024. Web. 20 June 2024.
APA style:
Numbermatics. (2024). Number 1018608953675625 - Facts about the integer. Retrieved 20 June 2024, from https://numbermatics.com/n/1018608953675625/
Chicago style:
Numbermatics. 2024. "Number 1018608953675625 - Facts about the integer". https://numbermatics.com/n/1018608953675625/
The information we have on file for 1018608953675625 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 1018608953675625, math, Factors of 1018608953675625, curriculum, school, college, exams, university, Prime factorization of 1018608953675625, STEM, science, technology, engineering, physics, economics, calculator, one quadrillion, eighteen trillion, six hundred eight billion, nine hundred fifty-three million, six hundred seventy-five thousand, six hundred twenty-five.