30755597509984256
30,755,597,509,984,256 is an even composite number composed of seven prime numbers multiplied together.
30755597509984256 is an even composite number. It is composed of seven distinct prime numbers multiplied together. It has a total of two thousand and sixteen divisors.
Prime factorization of 30755597509984256:
220 × 7 × 13 × 19 × 47 × 612 × 97
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 7 × 13 × 19 × 47 × 61 × 61 × 97)See below for interesting mathematical facts about the number 30755597509984256 from the Numbermatics database.
Names of 30755597509984256
- Cardinal: 30755597509984256 can be written as Thirty quadrillion, seven hundred fifty-five trillion, five hundred ninety-seven billion, five hundred nine million, nine hundred eighty-four thousand, two hundred fifty-six.
Scientific notation
- Scientific notation: 3.0755597509984256 × 1016
Factors of 30755597509984256
Divisors of 30755597509984256
- Number of divisors d(n): 2016
-
Complete list of divisors:
1 2 4 7 8 13 14 16 19 26 28 32 38 47 52 56 61 64 76 91 94 97 104 112 122 128 133 152 182 188 194 208 224 244 247 256 266 304 329 364 376 388 416 427 448 488 494 512 532 608 611 658 679 728 752 776 793 832 854 893 896 976 988 1024 1064 1159 1216 1222 1261 1316 1358 1456 1504 1552 1586 1664 1708 1729 1786 1792 1843 1952 1976 2048 2128 2318 2432 2444 2522 2632 2716 2867 2912 3008 3104 3172 3328 3416 3458 3572 3584 3686 3721 3904 3952 4096 4256 4277 4559 4636 4864 4888 5044 5264 5432 5551 5734 5824 5917 6016 6208 6251 6344 6656 6832 6916 7144 7168 7372 7442 7808 7904 8113 8192 8512 8554 8827 9118 9272 9728 9776 10088 10528 10864 11102 11468 11609 11648 11834 12032 12416 12502 12688 12901 13312 13664 13832 14288 14336 14744 14884 15067 15616 15808 16226 16384 17024 17108 17654 18236 18544 19456 19552 20069 20176 21056 21728 22204 22936 23218 23296 23668 23959 24064 24832 25004 25376 25802 26047 26624 27328 27664 28576 28672 29488 29768 30134 31232 31616 31913 32452 32768 34048 34216 35308 36472 37088 37271 38912 39104 40138 40352 41419 42112 43456 44408 45872 46436 46592 47336 47918 48128 48373 49664 50008 50752 51604 52094 53248 54473 54656 55328 57152 57344 58976 59267 59536 60268 62464 63232 63826 64904 65536 68096 68432 70616 70699 72944 74176 74542 76921 77824 78208 80276 80704 81263 82838 84224 86621 86912 88816 91744 92872 93184 94672 95836 96256 96746 99328 100016 101504 103208 104188 105469 106496 108946 109312 110656 112423 114304 114688 117952 118534 119072 120536 124928 126464 127652 129808 131072 136192 136864 141232 141398 145888 148352 149084 153842 155648 156416 160552 161408 162526 165676 167713 168448 173242 173824 174887 177632 183488 185744 186368 189344 191672 192512 193492 198656 200032 203008 206416 208376 210938 212992 217892 218624 221312 224846 228608 229376 235904 237068 238144 241072 249856 252928 255304 259616 260897 262144 272384 273728 278099 282464 282796 291776 296704 298168 307684 311296 312832 321104 322816 325052 331352 335426 336896 338611 346484 347648 349774 355264 360937 366976 371488 372736 378688 381311 383344 385024 386984 397312 400064 406016 412832 414869 416752 421876 425984 435784 437248 442624 449692 457216 458752 471808 474136 476288 482144 494893 499712 505856 510608 519232 521794 524288 538447 544768 547456 556198 564928 565592 583552 593408 596336 606347 615368 622592 625664 642208 645632 650104 662704 670852 673792 677222 692968 695296 699548 708149 710528 721874 733952 742976 745472 757376 762622 766688 770048 773968 786961 794624 800128 812032 825664 829738 833504 843752 851968 871568 874496 885248 899384 914432 917504 919087 943616 948272 952576 964288 989786 999424 1011712 1021216 1038464 1043588 1048576 1076894 1089536 1094912 1112396 1126073 1129856 1131184 1167104 1186816 1192672 1212694 1224209 1230736 1245184 1251328 1284416 1291264 1300208 1325408 1341704 1347584 1354444 1385936 1390592 1399096 1416298 1421056 1443748 1461499 1467904 1485952 1490944 1514752 1525244 1533376 1540096 1547936 1573922 1589248 1600256 1624064 1651328 1659476 1667008 1687504 1703936 1743136 1748992 1770496 1798768 1828864 1835008 1838174 1887232 1896544 1905152 1928576 1946693 1979572 1998848 2023424 2042432 2076928 2087176 2153788 2179072 2189824 2224792 2252146 2259712 2262368 2273531 2334208 2373632 2385344 2425388 2448418 2461472 2490368 2502656 2526559 2568832 2582528 2600416 2650816 2683408 2695168 2708888 2771872 2781184 2798192 2832596 2842112 2887496 2922998 2935808 2971904 2981888 3029504 3050488 3066752 3080192 3095872 3147844 3178496 3200512 3248128 3302656 3318952 3322853 3334016 3375008 3407872 3486272 3497984 3540992 3597536 3615287 3657728 3670016 3676348 3774464 3793088 3810304 3857152 3893386 3959144 3997696 4046848 4084864 4153856 4174352 4307576 4358144 4379648 4449584 4504292 4519424 4524736 4547062 4668416 4692181 4747264 4770688 4850776 4896836 4922944 4957043 4980736 5005312 5053118 5137664 5165056 5200832 5283881 5301632 5366816 5390336 5417776 5543744 5562368 5596384 5665192 5684224 5774992 5845996 5871616 5943808 5963776 6059008 6100976 6133504 6160384 6191744 6295688 6356992 6401024 6433609 6496256 6605312 6637904 6645706 6668032 6750016 6815744 6857803 6972544 6995968 7081984 7195072 7230574 7315456 7340032 7352696 7548928 7586176 7620608 7714304 7786772 7882511 7918288 7995392 8093696 8169728 8307712 8348704 8615152 8716288 8759296 8899168 9008584 9038848 9049472 9094124 9336832 9384362 9494528 9541376 9701552 9793672 9845888 9914086 9961472 10010624 10106236 10230493 10275328 10330112 10401664 10567762 10603264 10733632 10780672 10835552 11087488 11124736 11192768 11330384 11368448 11549984 11691992 11743232 11887616 11927552 12118016 12201952 12267008 12320768 12383488 12591376 12713984 12802048 12867218 12992512 13210624 13275808 13291412 13336064 13500032 13631488 13715606 13945088 13991936 14163968 14390144 14461148 14630912 14705392 15097856 15172352 15241216 15428608 15573544 15765022 15836576 15914717 15990784 16187392 16339456 16615424 16697408 16964039 17230304 17432576 17518592 17798336 18017168 18077696 18098944 18188248 18673664 18768724 18989056 19082752 19403104 19587344 19691776 19828172 19922944 20021248 20212472 20460986 20550656 20660224 20803328 21135524 21206528 21467264 21561344 21671104 22174976 22249472 22385536 22660768 22736896 23099968 23259971 23383984 23486464 23775232 23855104 24236032 24403904 24534016 24641536 24766976 25182752 25307009 25427968 25604096 25734436 25985024 26421248 26551616 26582824 26672128 27000064 27431212 27890176 27983872 28327936 28780288 28922296 29261824 29410784 30195712 30344704 30482432 30857216 31147088 31530044 31673152 31829434 31981568 32374784 32678912 32845267 33230848 33394816 33928078 34460608 34865152 35037184 35596672 36034336 36155392 36197888 36376496 36987167 37347328 37537448 37978112 38165504 38806208 39174688 39383552 39656344 40042496 40424944 40921972 41101312 41320448 41606656 42271048 42413056 42934528 43122688 43197089 43342208 44349952 44498944 44771072 45321536 45473792 46199936 46519942 46767968 46972928 47550464 47710208 48004621 48472064 48807808 49068032 49283072 49533952 50365504 50614018 50855936 51208192 51468872 51970048 52842496 53103232 53165648 53344256 54000128 54862424 55780352 55967744 56655872 57560576 57844592 58523648 58821568 60391424 60689408 60964864 61714432 62294176 63060088 63346304 63658868 63963136 64749568 65357824 65690534 66461696 66789632 67856156 68690453 68921216 69730304 70074368 71193344 72068672 72310784 72395776 72752992 73974334 74694656 75074896 75956224 76331008 77612416 78349376 78767104 79312688 80084992 80849888 81843944 82202624 82640896 83213312 84542096 84826112 85869056 86245376 86394178 86684416 88699904 88997888 89151439 89542144 90643072 90947584 92399872 93039884 93535936 93945856 95100928 95420416 96009242 96944128 97615616 98136064 99067904 100731008 101228036 101711872 102416384 102937744 103940096 105684992 106206464 106331296 106688512 108000256 109724848 111560704 111935488 113311744 115121152 115689184 117047296 117643136 118748273 120782848 121378816 121929728 123428864 124588352 126120176 126692608 127317736 129499136 130715648 131381068 132923392 133579264 135712312 137380906 137842432 139460608 140148736 142386688 144137344 144621568 144791552 145505984 147948668 149389312 150149792 151912448 152662016 155224832 156698752 157534208 158625376 160169984 161699776 163687888 164405248 165281792 166426624 169084192 169652224 171738112 172490752 172788356 173368832 177399808 177995776 178302878 179084288 181286144 181895168 184799744 186079768 187071872 187891712 190201856 192018484 193888256 195231232 196272128 198135808 201462016 202456072 204832768 205875488 207880192 211369984 212412928 212662592 213377024 216000512 219449696 220532507 223121408 223870976 226623488 230242304 231378368 234094592 235286272 237496546 241565696 242757632 243859456 246857728 249176704 252240352 253385216 254635472 258998272 261431296 262762136 265846784 267158528 271424624 274761812 275684864 280297472 284773376 288274688 289243136 289583104 291011968 295897336 298778624 300299584 302379623 303824896 305324032 310449664 313397504 315068416 317250752 320339968 322316741 323399552 327375776 328810496 330563584 332853248 338168384 339304448 343476224 344981504 345576712 346737664 354799616 355991552 356605756 358168576 362572288 363790336 369599488 372159536 374143744 375783424 380403712 384036968 387776512 390462464 392544256 396271616 402924032 404912144 409665536 411750976 415760384 422739968 424825856 425325184 426754048 432001024 438899392 441065014 446242816 447741952 453246976 460484608 462756736 468189184 470572544 474993092 480833171 483131392 485515264 487718912 493715456 498353408 504480704 506770432 509270944 522862592 525524272 531693568 534317056 542849248 549523624 551369728 560594944 569546752 576549376 578486272 579166208 582023936 591794672 597557248 600599168 604759246 607649792 610648064 620899328 624060073 626795008 630136832 634501504 640679936 644633482 646799104 654751552 657620992 661127168 665706496 676336768 678608896 686952448 691153424 693475328 709599232 711983104 713211512 716337152 725144576 727580672 739198976 744319072 748287488 751566848 760807424 768073936 775553024 780924928 785088512 792543232 805848064 809824288 819331072 823501952 831520768 845479936 849651712 850650368 853508096 864002048 877798784 882130028 892485632 906493952 920969216 925513472 936378368 941145088 949986184 961666342 966262784 971030528 975437824 987430912 996706816 1008961408 1013540864 1018541888 1045725184 1051048544 1063387136 1068634112 1085698496 1099047248 1102739456 1121189888 1139093504 1153098752 1156972544 1158332416 1164047872 1183589344 1195114496 1201198336 1209518492 1215299584 1221296128 1241798656 1248120146 1253590016 1260273664 1269003008 1289266964 1293598208 1309503104 1315241984 1322254336 1331412992 1352673536 1357217792 1373904896 1382306848 1386950656 1419198464 1426423024 1432674304 1450289152 1455161344 1478397952 1488638144 1496574976 1503133696 1521614848 1536147872 1543727549 1551106048 1561849856 1570177024 1585086464 1611696128 1619648576 1638662144 1647003904 1690959872 1699303424 1701300736 1707016192 1728004096 1755597568 1764260056 1784971264 1812987904 1841938432 1851026944 1882290176 1899972368 1923332684 1932525568 1942061056 1950875648 1974861824 1993413632 2017922816 2027081728 2037083776 2091450368 2102097088 2126774272 2137268224 2171396992 2198094496 2205478912 2242379776 2256217187 2278187008 2306197504 2313945088 2316664832 2328095744 2367178688 2390228992 2402396672 2419036984 2442592256 2483597312 2496240292 2507180032 2520547328 2538006016 2578533928 2587196416 2619006208 2630483968 2662825984 2705347072 2714435584 2747809792 2764613696 2773901312 2838396928 2852846048 2865348608 2900578304 2910322688 2956795904 2977276288 2993149952 3006267392 3043229696 3072295744 3087455098 3102212096 3123699712 3140354048 3170172928 3223392256 3239297152 3277324288 3294007808 3381919744 3398606848 3402601472 3414032384 3456008192 3511195136 3528520112 3569942528 3683876864 3702053888 3764580352 3799944736 3846665368 3884122112 3901751296 3949723648 3986827264 4035845632 4054163456 4074167552 4182900736 4190117633 4204194176 4253548544 4274536448 4342793984 4396188992 4410957824 4484759552 4512434374 4556374016 4612395008 4627890176 4633329664 4656191488 4734357376 4780457984 4804793344 4838073968 4885184512 4967194624 4992480584 5014360064 5041094656 5076012032 5157067856 5174392832 5238012416 5260967936 5325651968 5410694144 5428871168 5495619584 5529227392 5547802624 5676793856 5705692096 5730697216 5801156608 5820645376 5913591808 5954552576 5986299904 6086459392 6144591488 6174910196 6204424192 6247399424 6280708096 6340345856 6446784512 6478594304 6554648576 6588015616 6763839488 6797213696 6805202944 6828064768 6912016384 7022390272 7057040224 7139885056 7367753728 7404107776 7529160704 7599889472 7693330736 7768244224 7899447296 7973654528 8071691264 8108326912 8148335104 8365801472 8380235266 8408388352 8507097088 8549072896 8685587968 8792377984 8821915648 9024868748 9112748032 9224790016 9255780352 9266659328 9312382976 9468714752 9609586688 9676147936 9770369024 9934389248 9984961168 10028720128 10082189312 10152024064 10314135712 10348785664 10476024832 10521935872 10651303936 10821388288 10857742336 10991239168 11058454784 11095605248 11353587712 11411384192 11461394432 11602313216 11827183616 11909105152 11972599808 12172918784 12289182976 12349820392 12494798848 12561416192 12680691712 12893569024 12957188608 13176031232 13527678976 13594427392 13610405888 13656129536 13824032768 14044780544 14114080448 14279770112 14735507456 14808215552 15058321408 15199778944 15386661472 15536488448 15798894592 15947309056 16143382528 16216653824 16296670208 16731602944 16760470532 16816776704 17098145792 17371175936 17584755968 17643831296 18049737496 18225496064 18449580032 18533318656 18624765952 18937429504 19219173376 19352295872 19540738048 19868778496 19969922336 20057440256 20164378624 20304048128 20628271424 20697571328 20952049664 21043871744 21302607872 21642776576 21715484672 21982478336 22116909568 22191210496 22707175424 22822768384 22922788864 23204626432 23654367232 23818210304 23945199616 24578365952 24699640784 24989597696 25122832384 25361383424 25787138048 25914377216 26352062464 27188854784 27220811776 27312259072 27648065536 28089561088 28228160896 28559540224 29330823431 29471014912 29616431104 30116642816 30399557888 30773322944 31072976896 31894618112 32286765056 32433307648 32593340416 33463205888 33520941064 33633553408 34196291584 34742351872 35169511936 35287662592 36099474992 36450992128 36899160064 37066637312 37249531904 37874859008 38438346752 38704591744 39081476096 39737556992 39939844672 40114880512 40328757248 40608096256 41256542848 41395142656 41904099328 42605215744 43285553152 43430969344 43964956672 44233819136 44382420992 45414350848 45645536768 45845577728 46409252864 47308734464 47636420608 47890399232 49156731904 49399281568 49979195392 50722766848 51574276096 51828754432 52704124928 54377709568 54441623552 55296131072 56179122176 56456321792 57119080448 58661646862 58942029824 59232862208 60233285632 60799115776 61546645888 62145953792 63789236224 64573530112 64866615296 65186680832 67041882128 67267106816 68392583168 69484703744 70339023872 70575325184 72198949984 72901984256 73798320128 74133274624 74499063808 75749718016 76876693504 77409183488 79475113984 79879689344 80229761024 80657514496 81216192512 82513085696 82790285312 83808198656 85210431488 86571106304 87929913344 88467638272 88764841984 90828701696 91291073536 91691155456 92818505728 94617468928 95272841216 95780798464 98313463808 98798563136 99958390784 103148552192 103657508864 105408249856 108755419136 108883247104 110592262144 112358244352 112912643584 117323293724 117884059648 118465724416 120466571264 121598231552 123093291776 127578472448 129147060224 129733230592 130373361664 134083764256 134534213632 136785166336 138969407488 140678047744 141150650368 144397899968 145803968512 147596640256 148998127616 151499436032 153753387008 154818366976 158950227968 159759378688 160459522048 162432385024 165026171392 165580570624 167616397312 173142212608 175859826688 176935276544 177529683968 182582147072 183382310912 185637011456 189234937856 190545682432 191561596928 196626927616 197597126272 199916781568 206297104384 207315017728 210816499712 217510838272 217766494208 224716488704 225825287168 234646587448 236931448832 240933142528 243196463104 246186583552 255156944896 258294120448 259466461184 260746723328 268167528512 269068427264 273570332672 277938814976 281356095488 282301300736 288795799936 291607937024 295193280512 297996255232 302998872064 307506774016 309636733952 317900455936 319518757376 320919044096 324864770048 330052342784 331161141248 335232794624 346284425216 353870553088 355059367936 365164294144 371274022912 378469875712 381091364864 383123193856 393253855232 395194252544 399833563136 412594208768 414630035456 421632999424 435021676544 435532988416 449432977408 451650574336 469293174896 473862897664 481866285056 486392926208 492373167104 510313889792 516588240896 518932922368 521493446656 536335057024 538136854528 555877629952 562712190976 564602601472 577591599872 590386561024 595992510464 605997744128 615013548032 619273467904 635800911872 639037514752 641838088192 649729540096 660104685568 662322282496 670465589248 692568850432 707741106176 730328588288 742548045824 762182729728 766246387712 786507710464 790388505088 825188417536 829260070912 843265998848 871065976832 898865954816 903301148672 938586349792 947725795328 963732570112 972785852416 984746334208 1020627779584 1033176481792 1042986893312 1072670114048 1076273709056 1111755259904 1125424381952 1155183199744 1180773122048 1191985020928 1211995488256 1230027096064 1238546935808 1278075029504 1283676176384 1299459080192 1320209371136 1324644564992 1340931178496 1385137700864 1415482212352 1460657176576 1524365459456 1532492775424 1573015420928 1580777010176 1658520141824 1686531997696 1742131953664 1797731909632 1806602297344 1877172699584 1895451590656 1945571704832 1969492668416 2041255559168 2066352963584 2085973786624 2145340228096 2152547418112 2223510519808 2250848763904 2310366399488 2383970041856 2423990976512 2460054192128 2477093871616 2556150059008 2598918160384 2640418742272 2649289129984 2681862356992 2770275401728 2830964424704 2921314353152 3048730918912 3146030841856 3161554020352 3317040283648 3373063995392 3484263907328 3595463819264 3613204594688 3754345399168 3790903181312 3891143409664 3938985336832 4132705927168 4171947573248 4290680456192 4305094836224 4447021039616 4501697527808 4620732798976 4847981953024 4920108384256 4954187743232 5112300118016 5197836320768 5280837484544 5363724713984 5540550803456 5661928849408 5842628706304 6097461837824 6292061683712 6323108040704 6634080567296 6746127990784 7190927638528 7226409189376 7508690798336 7782286819328 7877970673664 8265411854336 8343895146496 8581360912384 8610189672448 8894042079232 9003395055616 9241465597952 9695963906048 9908375486464 10224600236032 10561674969088 10727449427968 11323857698816 11685257412608 12194923675648 12584123367424 12646216081408 13268161134592 14452818378752 15017381596672 15564573638656 15755941347328 16687790292992 17162721824768 17220379344896 17788084158464 18006790111232 18482931195904 19391927812096 19816750972928 20449200472064 21123349938176 22647715397632 23370514825216 24389847351296 25168246734848 25292432162816 26536322269184 28905636757504 30034763193344 31129147277312 31511882694656 34325443649536 34440758689792 36013580222464 36965862391808 38783855624192 39633501945856 40898400944128 42246699876352 45295430795264 46741029650432 50336493469696 50584864325632 57811273515008 60069526386688 62258294554624 63023765389312 68650887299072 72027160444928 73931724783616 79267003891712 81796801888256 84493399752704 93482059300864 101169728651264 115622547030016 120139052773376 124516589109248 126047530778624 137301774598144 147863449567232 158534007783424 163593603776512 168986799505408 202339457302528 231245094060032 240278105546752 252095061557248 274603549196288 295726899134464 317068015566848 327187207553024 337973599010816 404678914605056 480556211093504 504190123114496 549207098392576 591453798268928 654374415106048 809357829210112 961112422187008 1098414196785152 1182907596537856 1618715658420224 1922224844374016 2196828393570304 2365815193075712 3844449688748032 4393656787140608 7688899377496064 15377798754992128 30755597509984256
- Sum of all divisors σ(n): 83595206428231680
- Sum of proper divisors (its aliquot sum) s(n): 52839608918247424
- 30755597509984256 is an abundant number, because the sum of its proper divisors (52839608918247424) is greater than itself. Its abundance is 22084011408263168
Bases of 30755597509984256
- Binary: 11011010100010000001101100100000111000000000000000000002
- Hexadecimal: 0x6D440D90700000
- Base-36: 8ETY6FZG5Q8
Squares and roots of 30755597509984256
- 30755597509984256 squared (307555975099842562) is 945906778196149767845605367873536
- 30755597509984256 cubed (307555975099842563) is 29091928152166733735223458334668996585583559049216
-
The
square root of 30755597509984256 is 175372738.7879434813 -
The
cube root of 30755597509984256 is 313310.3364201357
Scales and comparisons
How big is 30755597509984256?- 30,755,597,509,984,256 seconds is equal to 977,932,867 years, 26 weeks, 2 days, 23 hours, 10 minutes, 56 seconds.
-
To count from 1 to 30,755,597,509,984,256 would take you about two billion, nine hundred thirty-three million, seven hundred ninety-eight thousand, six hundred two 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 30755597509984256 cubic inches would be around 26109.2 feet tall.
Recreational maths with 30755597509984256
- 30755597509984256 backwards is 65248990579555703
- The number of decimal digits it has is: 17
- The sum of 30755597509984256's digits is 89
- 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 30755597509984256 - Facts about the integer". Numbermatics.com. 2024. Web. 6 June 2024.
APA style:
Numbermatics. (2024). Number 30755597509984256 - Facts about the integer. Retrieved 6 June 2024, from https://numbermatics.com/n/30755597509984256/
Chicago style:
Numbermatics. 2024. "Number 30755597509984256 - Facts about the integer". https://numbermatics.com/n/30755597509984256/
The information we have on file for 30755597509984256 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 30755597509984256, math, Factors of 30755597509984256, curriculum, school, college, exams, university, Prime factorization of 30755597509984256, STEM, science, technology, engineering, physics, economics, calculator, thirty quadrillion, seven hundred fifty-five trillion, five hundred ninety-seven billion, five hundred nine million, nine hundred eighty-four thousand, two hundred fifty-six.