50966833415400
50,966,833,415,400 is an even composite number composed of nine prime numbers multiplied together.
50966833415400 is an even composite number. It is composed of nine distinct prime numbers multiplied together. It has a total of two thousand, three hundred four divisors.
Prime factorization of 50966833415400:
23 × 32 × 52 × 7 × 19 × 37 × 67 × 157 × 547
(2 × 2 × 2 × 3 × 3 × 5 × 5 × 7 × 19 × 37 × 67 × 157 × 547)See below for interesting mathematical facts about the number 50966833415400 from the Numbermatics database.
Names of 50966833415400
- Cardinal: 50966833415400 can be written as Fifty trillion, nine hundred sixty-six billion, eight hundred thirty-three million, four hundred fifteen thousand, four hundred.
Scientific notation
- Scientific notation: 5.09668334154 × 1013
Factors of 50966833415400
Divisors of 50966833415400
- Number of divisors d(n): 2304
-
Complete list of divisors:
1 2 3 4 5 6 7 8 9 10 12 14 15 18 19 20 21 24 25 28 30 35 36 37 38 40 42 45 50 56 57 60 63 67 70 72 74 75 76 84 90 95 100 105 111 114 120 126 133 134 140 148 150 152 157 168 171 175 180 185 190 200 201 210 222 225 228 252 259 266 268 280 285 296 300 314 315 333 335 342 350 360 370 380 399 402 420 444 450 456 469 471 475 504 518 525 532 536 547 555 570 600 603 628 630 665 666 670 684 700 703 740 760 777 785 798 804 840 855 888 900 925 938 942 950 1005 1036 1050 1064 1094 1099 1110 1140 1197 1206 1256 1260 1273 1295 1330 1332 1340 1368 1400 1406 1407 1413 1425 1480 1554 1570 1575 1596 1608 1641 1665 1675 1710 1800 1850 1876 1884 1900 1995 2010 2072 2100 2109 2188 2198 2220 2280 2331 2345 2355 2394 2412 2479 2520 2546 2590 2660 2664 2680 2735 2775 2812 2814 2826 2850 2983 3015 3108 3140 3150 3192 3282 3297 3325 3330 3350 3420 3515 3700 3752 3768 3800 3819 3829 3885 3925 3990 4020 4200 4218 4221 4275 4376 4396 4440 4662 4690 4710 4788 4824 4921 4923 4958 5025 5092 5180 5320 5470 5495 5550 5624 5628 5652 5700 5809 5966 5985 6030 6216 6280 6300 6327 6365 6475 6564 6594 6650 6660 6700 6840 7030 7035 7065 7400 7437 7638 7658 7770 7850 7980 8040 8205 8325 8436 8442 8550 8792 8911 8949 9324 9380 9420 9576 9842 9846 9891 9916 9975 10050 10184 10360 10393 10519 10545 10940 10990 11100 11256 11304 11400 11457 11487 11618 11655 11725 11775 11932 11970 12060 12395 12600 12654 12730 12950 13128 13188 13300 13320 13400 13675 14060 14070 14130 14763 14874 14915 15075 15276 15316 15540 15700 15960 16410 16485 16650 16872 16884 17100 17353 17427 17575 17822 17898 18648 18760 18840 19095 19145 19425 19684 19692 19782 19832 19950 20100 20239 20786 20881 21038 21090 21105 21880 21980 22200 22311 22914 22974 23236 23310 23450 23550 23864 23940 24120 24605 24615 24790 25308 25460 25900 26376 26600 26733 26847 27350 27475 28120 28140 28260 29045 29526 29748 29830 29925 30150 30552 30632 31080 31179 31400 31557 31635 31825 32820 32970 33300 33768 34200 34461 34706 34854 35150 35175 35325 35644 35796 36649 37185 38190 38290 38850 39368 39384 39564 39900 40200 40478 40663 41025 41572 41762 42076 42180 42210 43960 44289 44555 44622 44745 45828 45948 46472 46620 46900 47100 47101 47880 49210 49230 49455 49580 50616 50920 51800 51965 52059 52281 52595 52725 53466 53694 54700 54950 56280 56520 57285 57435 58090 58275 59052 59496 59660 59850 60300 60717 61975 62358 62643 63114 63270 63650 65640 65940 66600 68922 69412 69708 70300 70350 70650 71288 71592 72751 73298 73633 73815 74370 74575 76380 76580 77700 79128 79800 80199 80956 81326 82050 82425 83144 83524 84152 84360 84420 85879 86765 87135 88578 89110 89244 89490 91656 91896 93240 93537 93800 94200 94202 94671 95475 95725 98420 98460 98910 99160 101195 103930 104118 104405 104562 105190 105450 105525 106932 107388 109400 109900 109947 110371 111555 114570 114870 116180 116550 118104 119320 119700 120600 121434 121989 123025 123075 123950 124716 125286 126228 126540 127300 131880 133665 134235 137844 138824 139416 140600 140700 141300 141303 141673 145225 145502 146596 147266 147630 148740 149150 152760 153160 155400 155895 156177 157785 158175 160398 161912 162652 164100 164850 167048 168840 171758 172305 173530 174270 177156 178220 178488 178980 182151 183245 185925 187074 187929 188404 189342 190950 191450 196840 196920 197820 199861 202390 203315 207860 208236 208810 209124 210380 210900 211050 213864 214776 218253 219800 219894 220742 220899 221445 222775 223110 223725 229140 229740 232360 233100 235505 239400 242868 243978 246050 246150 247275 247900 249432 250572 252456 253080 254600 256543 257637 259825 260295 261405 262975 267330 268470 275688 281400 282600 282606 283346 286425 287175 290450 291004 293192 294532 295260 297480 298300 303585 311790 312354 313215 315570 316350 320796 325304 328200 329700 329707 329841 331113 343516 344610 347060 348540 354312 356440 357960 363755 364302 365967 366490 368165 369075 371850 374148 375858 376808 378684 381900 382900 384541 389203 395640 399722 400995 404780 406630 415720 416472 417620 418248 420760 421800 422100 423909 425019 429395 433825 435675 436506 439788 441484 441798 442890 445550 446220 447450 458280 459480 466200 467685 471010 473355 485736 487956 492100 492300 494550 495800 501144 505975 513086 515274 519650 520590 522025 522810 525950 534660 536940 549735 551855 557775 565212 566692 572850 574350 580900 582008 589064 590520 596600 599583 601153 607170 609945 623580 624708 626430 631140 632700 641592 654759 659400 659414 659682 662226 662697 668325 671175 687032 689220 694120 696331 697080 706515 708365 727510 728604 731934 732980 736330 738150 743700 748296 751716 757368 763800 765800 769082 769629 772597 772911 778406 779475 780885 788925 799444 801990 809560 813260 835240 844200 847818 850038 858790 861525 867650 871350 873012 879576 882968 883596 885780 891100 892440 894900 910755 916225 935370 939645 942020 946710 975912 984200 984600 989100 989121 993339 999305 1011950 1016575 1026172 1030548 1039300 1041180 1044050 1045620 1051900 1069320 1073880 1091265 1099470 1103710 1104495 1107225 1115550 1130424 1133384 1145700 1148700 1153623 1161800 1167609 1177525 1199166 1202306 1214340 1219890 1247160 1249416 1252860 1262280 1265400 1275057 1282715 1288185 1301475 1307025 1309518 1318828 1319364 1324452 1325394 1336650 1342350 1356013 1378440 1392662 1399027 1413030 1416730 1455020 1457208 1463868 1465960 1472660 1476300 1487400 1503432 1517925 1538164 1539258 1545194 1545822 1556812 1558950 1561770 1566075 1577850 1598888 1603980 1626520 1631701 1648535 1649205 1655565 1695636 1700076 1717580 1723050 1735300 1742700 1746024 1767192 1771560 1782200 1789800 1798749 1803459 1818775 1821510 1829835 1832450 1840825 1870740 1879290 1884040 1893420 1922705 1946015 1978200 1978242 1986678 1998610 2004975 2023900 2033150 2052344 2061096 2078600 2082360 2088100 2088993 2091240 2103800 2119545 2125095 2146975 2182530 2198940 2207420 2208990 2214450 2231100 2291400 2297400 2307246 2308887 2317791 2335218 2338425 2355050 2366775 2398332 2404612 2428680 2439780 2505720 2550114 2565430 2576370 2602950 2614050 2619036 2637656 2638728 2648904 2650788 2673300 2684700 2691787 2712026 2724421 2748675 2759275 2785324 2798054 2826060 2833460 2910040 2927736 2945320 2952600 2967363 2997915 3005765 3035850 3049725 3076328 3078516 3090388 3091644 3113624 3117900 3123540 3132150 3155700 3177523 3207960 3263402 3273795 3297070 3298410 3311130 3313485 3391272 3400152 3435160 3446100 3460869 3470600 3481655 3485400 3502827 3532575 3541825 3597498 3606918 3637550 3643020 3659670 3664900 3681650 3741480 3758580 3786840 3845410 3848145 3862985 3864555 3892030 3904425 3956484 3973356 3997220 4009950 4047800 4066300 4068039 4176200 4177986 4197081 4239090 4250190 4293950 4365060 4397880 4414840 4417980 4428900 4462200 4553775 4614492 4617774 4635582 4670436 4676850 4698225 4710100 4733550 4796664 4809224 4874317 4879560 4895103 4945605 4966695 4996525 5100228 5130860 5152740 5205900 5228100 5238072 5301576 5346600 5369400 5383574 5410377 5424052 5448842 5456325 5497350 5518550 5522475 5570648 5596108 5652120 5666920 5753893 5768115 5838045 5934726 5995830 6011530 6071700 6099450 6157032 6180776 6183288 6235800 6247080 6264300 6266979 6311400 6355046 6375285 6413575 6440925 6526804 6547590 6594140 6596820 6622260 6626970 6780065 6892200 6921738 6953373 6963310 6995135 7005654 7065150 7083650 7194996 7213836 7275100 7286040 7319340 7329800 7363300 7394857 7517160 7690820 7696290 7725970 7729110 7784060 7808850 7912968 7946712 7994440 8019900 8075361 8132600 8136078 8158505 8173263 8242675 8246025 8277825 8355972 8394162 8478180 8500380 8587900 8730120 8835960 8857800 8993745 9017295 9107550 9149175 9228984 9235548 9271164 9340872 9353700 9396450 9420200 9467100 9492091 9532569 9613525 9730075 9748634 9790206 9891210 9933390 9993050 10200456 10261720 10305480 10411800 10444965 10456200 10597725 10625475 10767148 10820754 10848104 10897684 10912650 10994700 11037100 11044950 11192216 11421907 11507786 11536230 11544435 11588955 11676090 11869452 11991660 12023060 12143400 12198900 12204117 12528600 12533958 12591243 12710092 12750570 12827150 12881850 13053608 13095180 13188280 13193640 13244520 13253940 13458935 13560130 13622105 13843476 13906746 13926620 13990270 14011308 14130300 14167300 14389992 14427672 14550200 14622951 14638680 14685309 14726600 14789714 14836815 14989575 15028825 15381640 15392580 15451940 15458220 15568120 15617700 15887615 16039800 16150722 16272156 16317010 16346526 16368975 16485350 16492050 16555650 16567425 16711944 16788324 16956360 17000760 17175800 17261679 17304345 17408275 17514135 17987490 18034590 18215100 18298350 18471096 18542328 18707400 18792900 18934200 18984182 19065138 19227050 19240725 19314925 19322775 19460150 19497268 19580412 19782420 19866780 19986100 20340195 20889930 20985405 21195450 21250950 21534296 21641508 21795368 21825300 21989400 22074200 22089900 22184571 22242661 22843814 23015572 23072460 23088870 23177910 23352180 23738904 23983320 24046120 24226083 24371585 24397800 24408234 24475515 24519789 24728025 24833475 25067916 25182486 25420184 25501140 25654300 25763700 25764247 26190360 26507880 26917870 27051885 27120260 27244210 27686952 27813492 27853240 27980540 28022616 28260600 28334600 28476273 28597707 28769465 28840575 29190225 29245902 29370618 29579428 29673630 29979150 30057650 30785160 30903880 30916440 31235400 31334895 31775230 31876425 32301444 32544312 32634020 32693052 32737950 32970700 32984100 33111300 33134850 33576648 33900325 34265721 34523358 34608690 34766865 34816550 34975675 35028270 35974980 36069180 36430200 36596700 36974285 37585800 37968364 38130276 38454100 38481450 38629850 38645550 38920300 38994536 39160824 39564840 39733560 39972200 40277251 40376805 40680390 40792525 40866315 41779860 41970810 42390900 42501900 43283016 43650600 43868853 44179800 44369142 44485322 44968725 45086475 45687628 46031144 46144920 46177740 46355820 46704360 47460455 47662845 48452166 48743170 48816468 48951030 49039578 49456050 49666950 50135832 50364972 51002280 51308600 51527400 51528494 51763999 51785037 52224825 53835740 54103770 54240520 54488420 55626984 55961080 56952546 57109535 57195414 57538930 57681150 57722175 57944775 58380450 58491804 58741236 59158856 59347260 59958300 60115300 60372937 61020585 62669790 62956215 63550460 63752850 64602888 65268040 65386104 65475900 65941400 65968200 66222600 66269700 66553713 66727983 67294675 67800650 68110525 68531442 69046716 69217380 69533730 69633100 69951350 70056540 71949960 72138360 73114755 73193400 73426545 73948570 74184075 75936728 76260552 76908200 76962900 77259700 77291100 77292741 77840600 79438075 80554502 80753610 81360780 81585050 81732630 83559720 83941620 84781800 85003800 85428819 86308395 86521725 87570675 87737706 88738284 88970644 89937450 90172950 91375256 92355480 92711640 94920910 95325690 96904332 97486340 97632936 97902060 98079156 98912100 99333900 100729944 101700975 102797163 103056988 103527998 103570074 104449650 104927025 107671480 108207540 108976840 109323967 110922855 111213305 113905092 114219070 114390828 115077860 115362300 115444350 115889550 116760900 116983608 117482472 118694520 119916600 120230600 120745874 120831753 121130415 121857925 122041170 122377575 122598945 125339580 125912430 127100920 127505700 128821235 130951800 132539400 133107426 133455966 134589350 135259425 135601300 136221050 137062884 138093432 138434760 139067460 139266200 139902700 140113080 142381365 142988535 143847325 146229510 146853090 147897140 148368150 153925800 154519400 154582200 154585482 155291997 156674475 158876150 161109004 161507220 162721560 163170100 163465260 167883240 170857638 171328605 172616790 173043450 173834325 175141350 175475412 177476568 177941288 179874900 180345900 180349729 181118811 184871425 189841820 190651380 193808664 194972680 195804120 196158312 197824200 198667800 200183949 201386255 201884025 203401950 204331575 205594326 206113976 207055996 207140148 208899300 209854050 212894041 216415080 218647934 219344265 221845710 222426610 227810184 228438140 228781656 230155720 230724600 230888700 231779100 231878223 233521800 237302275 238314225 241491748 241663506 242260830 243715850 244082340 244755150 245197890 250679160 251824860 255011400 257642470 258819995 258925185 266214852 266911932 269178700 270518850 271202600 272442100 274125768 278134920 279805400 284762730 285547675 285977070 287694650 292459020 293706180 295794280 296736300 301864685 305102925 309170964 310583994 313348950 314781075 317752300 322218008 323014440 326340200 326930520 327971901 332768565 333639915 341715276 342657210 345233580 346086900 347668650 350282700 350950824 359749800 360691800 360699458 362237622 362495259 365573775 367132725 369742850 379683640 381302760 386463705 400367898 402772510 403768050 406803900 408663150 411188652 414111992 414280296 417798600 419708100 422610559 425788082 427144095 431541975 437295868 438688530 443691420 444853220 456876280 461777400 463558200 463756446 465875991 474604550 476628450 482983496 483327012 484521660 487431700 488164680 489510300 490395780 503649720 513985815 515284940 517639990 517850370 532429704 533823864 538357400 541037700 541049187 543356433 544884200 546619835 554614275 556066525 569525460 571095350 571954140 575389300 584918040 587412360 593472600 603729370 604158765 605652075 610205850 612994725 618341928 621167988 626697900 629562150 635504600 638682123 644106175 655943802 665537130 667279830 683430552 685314420 690467160 692173800 695337300 700565400 711906825 714942675 721398916 724475244 724990518 731147550 734265450 739485700 765267769 772927410 776459985 800735796 805545020 807536100 813607800 817326300 822377304 839416200 845221118 851576164 854288190 856643025 863083950 874591736 877377060 887382840 889706440 901748645 905594055 927512892 931751982 949209100 953256900 966654024 969043320 974863400 979020600 980791560 983915703 1000919745 1006931275 1027971630 1030569880 1035279980 1035700740 1064470205 1082075400 1082098374 1086712866 1093239670 1096721325 1109228550 1112133050 1139050920 1142190700 1143908280 1150778600 1159391115 1207458740 1208317530 1211304150 1220411700 1225989450 1242335976 1253395800 1259124300 1267831677 1277364246 1288212350 1294099975 1294625925 1311887604 1331074260 1334559660 1370628840 1390674600 1423813650 1429885350 1442797832 1448950488 1449981036 1462295100 1468530900 1478971400 1490258287 1509323425 1530535538 1545854820 1552919970 1601471592 1611090040 1615072200 1623147561 1634652600 1639859505 1663842825 1668199575 1690442236 1703152328 1708576380 1713286050 1726167900 1754754120 1803497290 1811188110 1812476295 1855025784 1863503964 1898418200 1906513800 1916046369 1932318525 1967831406 2001839490 2013862550 2055943260 2070559960 2071401480 2113052795 2128940410 2135720475 2164196748 2173425732 2186479340 2193442650 2218457100 2224266100 2284381400 2295803307 2318782230 2329379955 2414917480 2416635060 2422608300 2440823400 2451978900 2518248600 2535663354 2554728492 2569929075 2576424700 2588199950 2589251850 2623775208 2662148520 2669119320 2705245935 2716782165 2733099175 2847627300 2859770700 2899962072 2924590200 2937061800 2980516574 3018646850 3020793825 3061071076 3091709640 3105839940 3193410615 3246295122 3279719010 3327685650 3336399150 3380884472 3417152760 3426572100 3452335800 3606994580 3622376220 3624952590 3727007928 3803495031 3826338845 3832092738 3864637050 3882299925 3935662812 4003678980 4027725100 4044986779 4111886520 4226105590 4257880820 4271440950 4328393496 4346851464 4372958680 4386885300 4436914200 4448532200 4470774861 4508743225 4527970275 4591606614 4637564460 4658759910 4833270120 4845216600 4903957800 4919578515 5004598725 5071326708 5109456984 5139858150 5152849400 5176399900 5178503700 5322351025 5410491870 5433564330 5466198350 5695254600 5719541400 5796955575 5961033148 6037293700 6041587650 6122142152 6211679880 6339158385 6386821230 6492590244 6559438020 6655371300 6672798300 6853144200 6887409921 7213989160 7244752440 7249905180 7451291435 7606990062 7652677690 7664185476 7729274100 7764599850 7871325624 8007357960 8055450200 8089973558 8115737805 8199297525 8452211180 8515761640 8542881900 8773770600 8941549722 9017486450 9055940550 9062381475 9183213228 9275128920 9317519820 9580231845 9839157030 10009197450 10142653416 10279716300 10352799800 10357007400 10565263975 10644702050 10820983740 10867128660 10932396700 11479016535 11593911150 11646899775 11922066296 12074587400 12083175300 12134960337 12678316770 12773642460 12985180488 13118876040 13310742600 13345596600 13412324583 13526229675 13583910825 13774819842 14499810360 14902582870 15213980124 15305355380 15328370952 15458548200 15529199700 15967053075 16179947116 16231475610 16398595050 16904422360 17085763800 17883099444 18034972900 18111881100 18124762950 18366426456 18635039640 19017475155 19131694225 19160463690 19678314060 20018394900 20224933895 20559432600 21130527950 21289404100 21641967480 21734257320 21864793400 22353874305 22958033070 23187822300 23293799550 24166350600 24269920674 24597892575 25356633540 25547284920 26824649166 27052459350 27167821650 27549639684 28314907453 29805165740 30427960248 30610710760 31058399400 31695791925 31934106150 32359894232 32462951220 32797190100 34437049605 35766198888 36069945800 36223762200 36249525900 36404881011 37256457175 38034950310 38263388450 38320927380 39356628120 40036789800 40449867790 40578689025 42261055900 42578808200 44707748610 45916066140 46375644600 46587599100 47901159225 48539841348 49195785150 50713267080 53649298332 54104918700 54335643300 55099279368 56629814906 57395082675 59610331480 60674801685 63391583850 63868212300 64925902440 65594380200 67061622915 68874099210 72499051800 72809762022 74512914350 76069900620 76526776900 76641854760 80899735580 81157378050 84522111800 84944722359 89415497220 91832132280 93175198200 95087375775 95802318450 97079682696 98391570300 101124669475 107298596664 108209837400 108671286600 111769371525 113259629812 114790165350 121349603370 126783167700 127736424600 134123245830 137748198420 141574537265 145619524044 149025828700 152139801240 153053553800 161799471160 162314756100 169889444718 172185248025 178830994440 182024405055 190174751550 191604636900 196783140600 202249338950 223538743050 226519259624 229580330700 242699206740 253566335400 254834167077 268246491660 275496396840 283149074530 291239048088 298051657400 303374008425 324629512200 335308114575 339778889436 344370496050 364048810110 380349503100 383209273800 404498677900 424723611795 447077486100 459160661400 485398413480 509668334154 536492983320 566298149060 606748016850 670616229150 679557778872 688740992100 707872686325 728097620220 760699006200 808997355800 849447223590 894154972200 910122025275 1019336668308 1132596298120 1213496033700 1274170835385 1341232458300 1377481984200 1415745372650 1456195240440 1698894447180 1820244050550 2038673336616 2123618058975 2426992067400 2548341670770 2682464916600 2831490745300 3397788894360 3640488101100 4247236117950 5096683341540 5662981490600 6370854176925 7280976202200 8494472235900 10193366683080 12741708353850 16988944471800 25483416707700 50966833415400
- Sum of all divisors σ(n): 216394611763200
- Sum of proper divisors (its aliquot sum) s(n): 165427778347800
- 50966833415400 is an abundant number, because the sum of its proper divisors (165427778347800) is greater than itself. Its abundance is 114460944932400
Bases of 50966833415400
- Binary: 10111001011010101001000000000001000100111010002
- Hexadecimal: 0x2E5AA40044E8
- Base-36: I2DU8OVE0
Squares and roots of 50966833415400
- 50966833415400 squared (509668334154002) is 2597618108393134028957160000
- 50966833415400 cubed (509668334154003) is 132392369407299322626984613503084264000000
-
The
square root of 50966833415400 is 7139105.9254923511 -
The
cube root of 50966833415400 is 37076.2569984287
Scales and comparisons
How big is 50966833415400?- 50,966,833,415,400 seconds is equal to 1,620,587 years, 33 weeks, 6 days, 6 hours, 30 minutes.
-
To count from 1 to 50,966,833,415,400 would take you about four million, fifty-one thousand, four hundred sixty-nine 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 50966833415400 cubic inches would be around 3089.7 feet tall.
Recreational maths with 50966833415400
- 50966833415400 backwards is 00451433866905
- The number of decimal digits it has is: 14
- The sum of 50966833415400's digits is 54
- More coming soon!
Link to this page
HTML: To link to this page, just copy and paste the link below into your blog, web page or email.
BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:
Cite this page
MLA style:
"Number 50966833415400 - Facts about the integer". Numbermatics.com. 2024. Web. 24 September 2024.
APA style:
Numbermatics. (2024). Number 50966833415400 - Facts about the integer. Retrieved 24 September 2024, from https://numbermatics.com/n/50966833415400/
Chicago style:
Numbermatics. 2024. "Number 50966833415400 - Facts about the integer". https://numbermatics.com/n/50966833415400/
The information we have on file for 50966833415400 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 50966833415400, math, Factors of 50966833415400, curriculum, school, college, exams, university, Prime factorization of 50966833415400, STEM, science, technology, engineering, physics, economics, calculator, fifty trillion, nine hundred sixty-six billion, eight hundred thirty-three million, four hundred fifteen thousand, four hundred.