41257183942656
41,257,183,942,656 is an even composite number composed of six prime numbers multiplied together.
41257183942656 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of two thousand, three hundred four divisors.
Prime factorization of 41257183942656:
211 × 33 × 112 × 193 × 29 × 31
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 3 × 11 × 11 × 19 × 19 × 19 × 29 × 31)See below for interesting mathematical facts about the number 41257183942656 from the Numbermatics database.
Names of 41257183942656
- Cardinal: 41257183942656 can be written as Forty-one trillion, two hundred fifty-seven billion, one hundred eighty-three million, nine hundred forty-two thousand, six hundred fifty-six.
Scientific notation
- Scientific notation: 4.1257183942656 × 1013
Factors of 41257183942656
Divisors of 41257183942656
- Number of divisors d(n): 2304
-
Complete list of divisors:
1 2 3 4 6 8 9 11 12 16 18 19 22 24 27 29 31 32 33 36 38 44 48 54 57 58 62 64 66 72 76 87 88 93 96 99 108 114 116 121 124 128 132 144 152 171 174 176 186 192 198 209 216 228 232 242 248 256 261 264 279 288 297 304 319 341 342 348 352 361 363 372 384 396 418 432 456 464 484 496 512 513 522 528 551 558 576 589 594 608 627 638 682 684 696 704 722 726 744 768 783 792 836 837 864 899 912 928 957 968 992 1023 1024 1026 1044 1056 1083 1089 1102 1116 1152 1178 1188 1216 1254 1276 1364 1368 1392 1408 1444 1452 1488 1536 1566 1584 1653 1672 1674 1728 1767 1798 1824 1856 1881 1914 1936 1984 2046 2048 2052 2088 2112 2166 2178 2204 2232 2299 2304 2356 2376 2432 2508 2552 2697 2728 2736 2784 2816 2871 2888 2904 2976 3069 3072 3132 3168 3249 3267 3306 3344 3348 3456 3509 3534 3596 3648 3712 3751 3762 3828 3872 3968 3971 4092 4104 4176 4224 4332 4356 4408 4464 4598 4608 4712 4752 4864 4959 5016 5104 5301 5394 5456 5472 5568 5632 5643 5742 5776 5808 5952 6061 6138 6144 6264 6336 6479 6498 6534 6612 6688 6696 6859 6897 6912 7018 7068 7192 7296 7424 7502 7524 7656 7744 7936 7942 8091 8184 8208 8352 8448 8613 8664 8712 8816 8928 9196 9207 9216 9424 9504 9728 9747 9889 9918 10032 10208 10469 10527 10602 10788 10912 10944 11136 11191 11253 11264 11286 11484 11552 11616 11904 11913 12122 12276 12528 12672 12958 12996 13068 13224 13376 13392 13718 13794 13824 14036 14136 14384 14592 14848 14877 15004 15048 15312 15488 15872 15884 15903 16182 16368 16416 16704 16896 17081 17226 17328 17424 17632 17856 18183 18392 18414 18432 18848 19008 19437 19456 19494 19778 19836 20064 20416 20577 20691 20938 21054 21204 21576 21824 21888 22272 22382 22506 22528 22572 22968 23104 23232 23808 23826 24244 24273 24552 25056 25344 25916 25992 26136 26448 26752 26784 27436 27588 27648 28072 28272 28768 29184 29667 29696 29754 30008 30096 30624 30976 31407 31581 31744 31768 31806 32364 32736 32832 33408 33573 33759 33792 34162 34452 34656 34848 35264 35712 35739 36366 36784 36828 37696 38016 38874 38912 38988 39556 39672 40128 40832 41154 41382 41876 42108 42408 43152 43648 43681 43776 44544 44764 45012 45144 45936 46208 46464 47616 47652 48488 48546 49104 50112 50688 51243 51832 51984 52272 52896 53504 53568 54549 54872 55176 55296 56144 56544 57536 58311 58368 59334 59392 59508 60016 60192 61248 61731 61952 62073 62814 63162 63488 63536 63612 64728 65472 65664 66671 66816 67146 67518 67584 68324 68904 69312 69696 70528 71269 71424 71478 72732 73568 73656 75392 75449 76032 77748 77976 79112 79344 80256 81664 82308 82764 83752 84216 84816 86304 87296 87362 87552 89001 89088 89528 90024 90288 91872 92416 92928 94221 94743 95232 95304 96976 97092 98208 100224 100719 101277 101376 102486 103664 103968 104544 105792 107008 107136 107217 108779 109098 109744 110352 112288 113088 115072 115159 116622 116736 118668 119016 120032 120384 122496 123101 123462 123904 124146 125628 126324 127072 127224 129456 130944 131043 131328 133342 133632 134292 135036 136648 137808 138624 139392 141056 142538 142848 142956 145464 147136 147312 150784 150898 152064 153729 155496 155952 158224 158688 160512 163328 163647 164616 165528 167504 168432 169632 172608 174592 174724 174933 175104 178002 178176 179056 180048 180576 183744 184832 185193 185856 187891 188442 189486 190464 190608 193952 194184 196416 198911 200013 200448 201438 202554 202752 204972 207328 207936 209088 211584 212629 213807 214016 214272 214434 217558 218196 219488 220704 224576 226176 226347 230144 230318 233244 237336 238032 240064 240768 244992 246202 246924 247808 248292 251256 252648 254144 254448 258912 261888 262086 262656 266684 267003 267264 268584 270072 273296 275616 277248 278784 282112 282663 285076 285696 285912 290928 294272 294624 301568 301796 302157 304128 307458 310992 311904 316448 317376 321024 324539 326337 326656 327294 329232 331056 335008 336864 339264 345216 345477 349184 349448 349866 350208 356004 358112 360096 361152 367488 369303 369664 370386 371712 375782 376884 378972 381216 387904 388368 392832 393129 397822 400026 400896 402876 405108 409944 414656 415872 418176 423168 425258 427614 428032 428544 428868 435116 436392 438976 441408 449152 452352 452694 460288 460636 461187 466488 474672 476064 480128 481536 489984 492404 493848 496584 502512 505296 508288 508896 517824 523776 524172 525312 533368 534006 534528 537168 540144 546592 551232 554496 557568 563673 564224 565326 570152 571392 571824 581856 588544 589248 596733 600039 603136 603592 604314 608256 614916 621984 623808 632896 634752 637887 641421 642048 649078 652674 653312 654588 658464 662112 670016 673728 678528 679041 690432 690954 698368 698896 699732 712008 716224 720192 722304 734976 738606 739328 740772 743424 751564 753768 757944 762432 775808 776736 785664 786258 795644 800052 801792 805752 810216 819888 829312 829939 831744 836352 846336 850516 855228 857088 857736 870232 872784 877952 882816 898304 904704 905388 920576 921272 922374 932976 949344 952128 960256 963072 973617 979011 979968 984808 987696 993168 1005024 1010592 1016576 1017792 1035648 1036431 1047552 1048344 1050624 1066736 1068012 1074336 1080288 1093184 1102464 1107909 1108992 1115136 1127346 1128448 1130652 1140304 1143648 1163712 1177088 1178496 1179387 1193466 1200078 1206272 1207184 1208628 1229832 1243968 1247616 1265792 1266749 1269504 1275774 1282842 1284096 1298156 1305348 1309176 1316928 1324224 1340032 1347456 1354111 1357056 1358082 1380864 1381908 1397792 1399464 1424016 1432448 1440384 1444608 1469952 1477212 1481544 1503128 1507536 1515888 1524864 1551616 1553472 1571328 1572516 1591288 1600104 1603584 1611504 1620432 1639776 1658624 1659878 1663488 1672704 1691019 1692672 1701032 1710456 1714176 1715472 1740464 1745568 1755904 1765632 1790199 1796608 1800117 1809408 1810776 1841152 1842544 1844748 1865952 1898688 1904256 1913661 1920512 1924263 1926144 1947234 1958022 1959936 1969616 1975392 1986336 2010048 2021184 2033152 2035584 2037123 2066801 2071296 2072862 2095104 2096688 2133472 2136024 2148672 2160576 2186368 2188021 2204928 2215818 2217984 2230272 2254692 2261304 2280608 2287296 2327424 2338919 2354176 2356992 2358774 2386932 2400156 2414368 2417256 2459664 2487936 2489817 2495232 2531584 2533498 2539008 2551548 2565684 2596312 2610696 2618352 2633856 2648448 2680064 2694912 2708222 2714112 2716164 2761728 2763816 2795584 2798928 2848032 2864896 2880768 2889216 2920851 2937033 2939904 2954424 2963088 3006256 3015072 3031776 3049728 3103232 3106944 3109293 3142656 3145032 3182576 3200208 3223008 3240864 3279552 3317248 3319756 3323727 3326976 3345408 3382038 3385344 3402064 3420912 3430944 3480928 3491136 3511808 3531264 3569929 3580398 3593216 3600234 3618816 3621552 3685088 3689496 3731904 3797376 3800247 3808512 3827322 3841024 3848526 3852288 3894468 3916044 3939232 3950784 3972672 4020096 4042368 4062333 4066304 4071168 4074246 4133602 4142592 4145724 4193376 4266944 4272048 4297344 4321152 4372736 4376042 4409856 4431636 4509384 4522608 4561216 4574592 4654848 4677838 4708352 4713984 4717548 4773864 4800312 4828736 4834512 4919328 4975872 4979634 4990464 5063168 5066996 5073057 5078016 5103096 5131368 5192624 5221392 5236704 5267712 5296896 5360128 5370597 5389824 5416444 5428224 5432328 5523456 5527632 5591168 5597856 5696064 5729792 5740983 5761536 5778432 5841702 5874066 5879808 5908848 5926176 6012512 6030144 6063552 6099456 6166241 6200403 6206464 6213888 6218586 6285312 6290064 6365152 6400416 6446016 6481728 6559104 6564063 6634496 6639512 6647454 6653952 6690816 6764076 6804128 6841824 6861888 6961856 6982272 7016757 7023616 7062528 7139858 7160796 7186432 7200468 7243104 7370176 7378992 7463808 7469451 7594752 7600494 7617024 7654644 7682048 7697052 7788936 7832088 7878464 7901568 7945344 8040192 8084736 8124666 8132608 8142336 8148492 8267204 8285184 8291448 8386752 8533888 8544096 8594688 8642304 8745472 8752084 8762553 8819712 8863272 9018768 9045216 9122432 9149184 9309696 9355676 9427968 9435096 9547728 9600624 9657472 9669024 9838656 9951744 9959268 9980928 10126336 10133992 10146114 10156032 10206192 10262736 10385248 10442784 10473408 10535424 10593792 10709787 10720256 10741194 10779648 10832888 10856448 10864656 11055264 11182336 11195712 11392128 11400741 11459584 11481966 11523072 11556864 11683404 11748132 11817696 11852352 12025024 12060288 12127104 12186999 12198912 12332482 12400806 12412928 12427776 12437172 12580128 12730304 12800832 12892032 12963456 13118208 13128126 13268992 13279024 13294908 13528152 13608256 13683648 13723776 13923712 13964544 14033514 14047232 14125056 14279716 14321592 14400936 14486208 14740352 14757984 14927616 14938902 15189504 15200988 15234048 15309288 15394104 15577872 15664176 15756928 15803136 15890688 16080384 16169472 16249332 16284672 16296984 16534408 16570368 16582896 16773504 17067776 17088192 17189376 17284608 17490944 17504168 17525106 17639424 17726544 18037536 18090432 18244864 18298368 18498723 18601209 18619392 18711352 18855936 18870192 19095456 19201248 19314944 19338048 19677312 19692189 19903488 19918536 19961856 20252672 20267984 20292228 20412384 20525472 20770496 20885568 20946816 21050271 21070848 21187584 21419574 21440512 21482388 21559296 21665776 21729312 22110528 22364672 22391424 22408353 22784256 22801482 22919168 22963932 23046144 23366808 23496264 23635392 23704704 24050048 24068231 24120576 24254208 24373998 24397824 24664964 24801612 24855552 24874344 25160256 25460608 25601664 25728109 25784064 25926912 26236416 26256252 26558048 26589816 27056304 27216512 27367296 27447552 27847424 27929088 28067028 28559432 28643184 28801872 28972416 29480704 29515968 29855232 29877804 30379008 30401976 30468096 30618576 30788208 31155744 31328352 31513856 31606272 31781376 32129361 32160768 32338944 32498664 32569344 32593968 33068816 33165792 33547008 34135552 34176384 34202223 34378752 34569216 34981888 35008336 35050212 35453088 36075072 36180864 36489728 36560997 36596736 36997446 37202418 37238784 37422704 37740384 38190912 38402496 38629888 38676096 39269219 39354624 39384378 39806976 39837072 40535968 40584456 40824768 41050944 41540992 41771136 41893632 42100542 42141696 42375168 42839148 42964776 43331552 43458624 44221056 44729344 44782848 44816706 45568512 45602964 45927864 46733616 46992528 47270784 47409408 48100096 48136462 48241152 48508416 48747996 49329928 49603224 49711104 49748688 50320512 50921216 51203328 51456218 51568128 51853824 52472832 52512504 53116096 53179632 54112608 54433024 54734592 54895104 55496169 55694848 55803627 55858176 56134056 57118864 57286368 57603744 57944832 58961408 59031936 59076567 59710464 59755608 60758016 60803952 61237152 61576416 62311488 62656704 63027712 63150813 63212544 63562752 64258722 64321536 64677888 64997328 65187936 66137632 66331584 67094016 67828651 68271104 68352768 68404446 68757504 69138432 70016672 70100424 70906176 72150144 72204693 72361728 72979456 73121994 73193472 73994892 74404836 74845408 75480768 76381824 76804992 77184327 77259776 77352192 78538438 78709248 78768756 79674144 81071936 81168912 81649536 82101888 83081984 83542272 83787264 84201084 85678296 85929552 86663104 86917248 88442112 89458688 89565696 89633412 91137024 91205928 91855728 93467232 93985056 94541568 94818816 96200192 96272924 96388083 96482304 97016832 97495992 98659856 99206448 99497376 100641024 101842432 102406656 102912436 103136256 103707648 104945664 105025008 106232192 106359264 108225216 108866048 109469184 109790208 110992338 111389696 111607254 111716352 112268112 114237728 114572736 115207488 115889664 117807657 117922816 118063872 118153134 119420928 119511216 121607904 122474304 123152832 124622976 125313408 126055424 126301626 126425088 127125504 128517444 129994656 130375872 132275264 132663168 134188032 135657302 136542208 136705536 136808892 140033344 140200848 141812352 144300288 144409386 144723456 145958912 146243988 147989784 148809672 149690816 150961536 152763648 153609984 154368654 154519552 154704384 157076876 157418496 157537512 159348288 162143872 162337824 163299072 164203776 166163968 166488507 167084544 167574528 168402168 171356592 171859104 173326208 173834496 176884224 179131392 179266824 182274048 182411856 183711456 186934464 187970112 189083136 189637632 192400384 192545848 192776166 192964608 194033664 194991984 197319712 198412896 198994752 201282048 203485953 203684864 204813312 205824872 206272512 207415296 210050016 212464384 212718528 216450432 216614079 217732096 218938368 219580416 221984676 222779392 223214508 224536224 228475456 229145472 230414976 231552981 231779328 235615314 235845632 236127744 236306268 239022432 243215808 244948608 246305664 249245952 250626816 252110848 252603252 257034888 259989312 260751744 264550528 265326336 268376064 271314604 273411072 273617784 280066688 280401696 283624704 288600576 288818772 289446912 292487976 295979568 297619344 299381632 301923072 305527296 307219968 308737308 309408768 314153752 314836992 315075024 318696576 324287744 324675648 326598144 328407552 332327936 332977014 334169088 335149056 336804336 342713184 343718208 346652416 347668992 353422971 353768448 358262784 358533648 364823712 367422912 373868928 375940224 378166272 379275264 384800768 385091696 385552332 389983968 394639424 396825792 397989504 402564096 406971906 407369728 409626624 411649744 420100032 424928768 425437056 432900864 433228158 435464192 437876736 443969352 446429016 449072448 456950912 458290944 460829952 463105962 463558656 471230628 472255488 472612536 478044864 486431616 489897216 492611328 498491904 501253632 505206504 514069776 519978624 521503488 529101056 530652672 542629208 546822144 547235568 560133376 560803392 567249408 577201152 577637544 578893824 584975952 591959136 595238688 598763264 603846144 610457859 611054592 614439936 617474616 618817536 628307504 630150048 637393152 648575488 649351296 649842237 653196288 656815104 664655872 665954028 668338176 673608672 685426368 687436416 693304832 694658943 695337984 706845942 707536896 717067296 729647424 734845824 746115161 747737856 751880448 756332544 770183392 771104664 779967936 789278848 793651584 795979008 805128192 813943812 823299488 840200064 849857536 850874112 865801728 866456316 887938704 892858032 898144896 913901824 916581888 921659904 926211924 942461256 944510976 945225072 956089728 972863232 979794432 985222656 996983808 1002507264 1010413008 1028139552 1039957248 1043006976 1058202112 1060268913 1061305344 1085258416 1094471136 1120266752 1121606784 1134498816 1154402304 1155275088 1169951904 1183918272 1190477376 1197526528 1207692288 1220915718 1222109184 1228879872 1234949232 1256615008 1260300096 1274786304 1297150976 1298702592 1299684474 1306392576 1313630208 1331908056 1347217344 1370852736 1374872832 1386609664 1389317886 1390675968 1413691884 1434134592 1459294848 1469691648 1492230322 1495475712 1503760896 1540366784 1542209328 1559935872 1578557696 1587303168 1591958016 1627887624 1646598976 1680400128 1699715072 1701748224 1731603456 1732912632 1775877408 1785716064 1796289792 1827803648 1831373577 1833163776 1843319808 1852423848 1884922512 1890450144 1912179456 1945726464 1959588864 1970445312 1993967616 2005014528 2020826016 2056279104 2079914496 2086013952 2116404224 2120537826 2122610688 2170516832 2188942272 2238345483 2240533504 2243213568 2268997632 2310550176 2339903808 2367836544 2380954752 2395053056 2415384576 2441831436 2469898464 2513230016 2520600192 2549572608 2594301952 2597405184 2599368948 2663816112 2694434688 2741705472 2749745664 2773219328 2778635772 2827383768 2868269184 2918589696 2939383296 2984460644 2990951424 3007521792 3080733568 3084418656 3119871744 3157115392 3174606336 3183916032 3255775248 3293197952 3360800256 3403496448 3463206912 3465825264 3551754816 3571432128 3592579584 3655607296 3662747154 3666327552 3686639616 3704847696 3769845024 3780900288 3824358912 3891452928 3919177728 3940890624 4041652032 4112558208 4159828992 4172027904 4232808448 4241075652 4341033664 4377884544 4476690966 4481067008 4486427136 4621100352 4679807616 4735673088 4761909504 4790106112 4883662872 4939796928 5026460032 5041200384 5099145216 5194810368 5198737896 5327632224 5388869376 5483410944 5499491328 5557271544 5654767536 5736538368 5837179392 5878766592 5968921288 5981902848 6015043584 6161467136 6168837312 6239743488 6314230784 6349212672 6367832064 6511550496 6586395904 6715036449 6721600512 6806992896 6931650528 7103509632 7142864256 7185159168 7311214592 7325494308 7409695392 7539690048 7561800576 7648717824 7782905856 8083304064 8225116416 8319657984 8482151304 8682067328 8755769088 8953381932 8972854272 9242200704 9359615232 9471346176 9523819008 9767325744 9879593856 10052920064 10082400768 10389620736 10397475792 10655264448 10777738752 10966821888 10998982656 11114543088 11309535072 11473076736 11674358784 11757533184 11937842576 12322934272 12337674624 12479486976 12628461568 12698425344 13023100992 13172791808 13430072898 13443201024 13863301056 14207019264 14285728512 14370318336 14650988616 14819390784 15079380096 15123601152 15297435648 16166608128 16450232832 16964302608 17364134656 17511538176 17906763864 17945708544 18484401408 18719230464 18942692352 19047638016 19534651488 19759187712 20105840128 20145109347 20164801536 20794951584 21310528896 21555477504 21933643776 22229086176 22619070144 22946153472 23348717568 23875685152 24645868544 24675349248 24958973952 26046201984 26345583616 26860145796 27726602112 28414038528 28571457024 29301977232 29638781568 30158760192 30247202304 32333216256 32900465664 33928605216 34728269312 35023076352 35813527728 36968802816 37438460928 37885384704 38095276032 39069302976 39518375424 40211680256 40290218694 40329603072 41589903168 42621057792 43110955008 44458172352 45238140288 45892306944 47751370304 49291737088 49350698496 52092403968 52691167232 53720291592 55453204224 56828077056 57142914048 58603954464 59277563136 60317520384 60494404608 64666432512 65800931328 67857210432 69456538624 70046152704 71627055456 73937605632 74876921856 78138605952 79036750848 80423360512 80580437388 83179806336 85242115584 88916344704 90476280576 95502740608 98701396992 104184807936 107440583184 110906408448 113656154112 114285828096 117207908928 118555126272 120635040768 120988809216 129332865024 135714420864 138913077248 143254110912 147875211264 156277211904 158073501696 161160874776 166359612672 170484231168 177832689408 180952561152 191005481216 197402793984 208369615872 214881166368 221812816896 234415817856 237110252544 241270081536 271428841728 286508221824 312554423808 322321749552 332719225344 340968462336 355665378816 361905122304 382010962432 416739231744 429762332736 443625633792 468831635712 474220505088 542857683456 573016443648 625108847616 644643499104 665438450688 711330757632 723810244608 764021924864 859524665472 937663271424 1085715366912 1146032887296 1250217695232 1289286998208 1330876901376 1422661515264 1528043849728 1719049330944 1875326542848 2171430733824 2292065774592 2578573996416 3438098661888 3750653085696 4584131549184 5157147992832 6876197323776 10314295985664 13752394647552 20628591971328 41257183942656
- Sum of all divisors σ(n): 151417244160000
- Sum of proper divisors (its aliquot sum) s(n): 110160060217344
- 41257183942656 is an abundant number, because the sum of its proper divisors (110160060217344) is greater than itself. Its abundance is 68902876274688
Bases of 41257183942656
- Binary: 10010110000101111011111100101100011000000000002
- Hexadecimal: 0x2585EFCB1800
- Base-36: EMHAE39C0
Squares and roots of 41257183942656
- 41257183942656 squared (412571839426562) is 1702155226878152084696334336
- 41257183942656 cubed (412571839426563) is 70226131294265276808199496681043227836416
-
The
square root of 41257183942656 is 6423175.5341618993 -
The
cube root of 41257183942656 is 34554.1218552095
Scales and comparisons
How big is 41257183942656?- 41,257,183,942,656 seconds is equal to 1,311,850 years, 43 weeks, 2 days, 57 minutes, 36 seconds.
-
To count from 1 to 41,257,183,942,656 would take you about three million, two hundred seventy-nine thousand, six hundred twenty-seven 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 41257183942656 cubic inches would be around 2879.5 feet tall.
Recreational maths with 41257183942656
- 41257183942656 backwards is 65624938175214
- The number of decimal digits it has is: 14
- The sum of 41257183942656's digits is 63
- 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 41257183942656 - Facts about the integer". Numbermatics.com. 2024. Web. 25 May 2024.
APA style:
Numbermatics. (2024). Number 41257183942656 - Facts about the integer. Retrieved 25 May 2024, from https://numbermatics.com/n/41257183942656/
Chicago style:
Numbermatics. 2024. "Number 41257183942656 - Facts about the integer". https://numbermatics.com/n/41257183942656/
The information we have on file for 41257183942656 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 41257183942656, math, Factors of 41257183942656, curriculum, school, college, exams, university, Prime factorization of 41257183942656, STEM, science, technology, engineering, physics, economics, calculator, forty-one trillion, two hundred fifty-seven billion, one hundred eighty-three million, nine hundred forty-two thousand, six hundred fifty-six.