693552025738469520
693,552,025,738,469,520 is an even composite number composed of six prime numbers multiplied together.
693552025738469520 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of one thousand, nine hundred twenty divisors.
Prime factorization of 693552025738469520:
24 × 33 × 5 × 73 × 372 × 8813
(2 × 2 × 2 × 2 × 3 × 3 × 3 × 5 × 7 × 7 × 7 × 37 × 37 × 881 × 881 × 881)See below for interesting mathematical facts about the number 693552025738469520 from the Numbermatics database.
Names of 693552025738469520
- Cardinal: 693552025738469520 can be written as Six hundred ninety-three quadrillion, five hundred fifty-two trillion, twenty-five billion, seven hundred thirty-eight million, four hundred sixty-nine thousand, five hundred twenty.
Scientific notation
- Scientific notation: 6.9355202573846952 × 1017
Factors of 693552025738469520
Divisors of 693552025738469520
- Number of divisors d(n): 1920
-
Complete list of divisors:
1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 27 28 30 35 36 37 40 42 45 48 49 54 56 60 63 70 72 74 80 84 90 98 105 108 111 112 120 126 135 140 144 147 148 168 180 185 189 196 210 216 222 240 245 252 259 270 280 294 296 315 333 336 343 360 370 378 392 420 432 441 444 490 504 518 540 555 560 588 592 630 666 686 720 735 740 756 777 784 840 881 882 888 945 980 999 1008 1029 1036 1080 1110 1176 1260 1295 1323 1332 1369 1372 1470 1480 1512 1554 1665 1680 1715 1762 1764 1776 1813 1890 1960 1998 2058 2072 2160 2205 2220 2331 2352 2520 2590 2643 2646 2664 2738 2744 2940 2960 3024 3087 3108 3330 3430 3524 3528 3626 3780 3885 3920 3996 4107 4116 4144 4405 4410 4440 4662 4995 5040 5145 5180 5286 5292 5328 5439 5476 5488 5880 6167 6174 6216 6615 6660 6845 6860 6993 7048 7056 7252 7560 7770 7929 7992 8214 8232 8810 8820 8880 9065 9261 9324 9583 9990 10290 10360 10572 10584 10878 10952 11655 11760 12321 12334 12348 12432 12691 13215 13230 13320 13690 13720 13986 14096 14504 15120 15435 15540 15858 15984 16317 16428 16464 17620 17640 18130 18501 18522 18648 19166 19980 20535 20580 20720 21144 21168 21756 21904 23310 23787 24642 24668 24696 25382 26430 26460 26640 27195 27380 27440 27972 28749 29008 30835 30870 31080 31716 32597 32634 32856 34965 35240 35280 36260 36963 37002 37044 37296 38073 38332 39645 39960 41070 41160 42288 43169 43512 46305 46620 47574 47915 48951 49284 49336 49392 50764 52860 52920 54390 54760 55503 55944 57498 61605 61670 61740 62160 63432 63455 65194 65268 65712 67081 69930 70480 72520 73926 74004 74088 76146 76664 79290 79920 81585 82140 82320 86247 86338 87024 92505 92610 93240 95148 95830 97791 97902 98568 98672 101528 105720 105840 108780 109520 111006 111888 114219 114996 118935 123210 123340 123480 126864 126910 129507 130388 130536 134162 139860 143745 145040 147852 148008 148176 152292 153328 158580 162985 163170 164280 166509 172494 172676 184815 185010 185220 186480 190296 190365 191660 195582 195804 197136 201243 203056 211440 215845 217560 222012 228179 228438 229992 237870 244755 246420 246680 246960 253820 258741 259014 260776 261072 268324 277515 279720 287490 293373 295704 296016 302183 304584 317160 325970 326340 328560 333018 335405 342657 344988 345352 369630 370020 370440 380592 380730 383320 388521 391164 391608 402486 431235 431690 435120 444024 456358 456876 459984 469567 475740 488955 489510 492840 493360 507640 517482 518028 521552 536648 555030 559440 571095 574980 586746 591408 603729 604366 609168 634320 647535 651940 652680 666036 670810 684537 685314 689976 690704 739260 740040 740880 761460 766640 776161 777042 782328 783216 804972 832545 862470 863380 880119 888048 906549 912716 913752 939134 951480 977910 979020 985680 1006215 1015280 1034964 1036056 1073296 1110060 1140895 1142190 1149960 1165563 1173492 1206089 1207458 1208732 1293705 1295070 1303880 1305360 1332072 1341620 1369074 1370628 1379952 1408701 1466865 1478520 1480080 1510915 1522920 1552322 1554084 1564656 1597253 1609944 1665090 1713285 1724940 1726760 1760238 1811187 1813098 1825432 1827504 1878268 1902960 1942605 1955820 1958040 2012430 2053611 2069928 2072112 2220120 2281790 2284380 2299920 2328483 2331126 2346984 2347835 2412178 2414916 2417464 2587410 2590140 2607760 2664144 2683240 2719647 2738148 2741256 2817402 2933730 2957040 3018645 3021830 3045840 3104644 3108168 3194506 3219888 3330180 3422685 3426570 3449880 3453520 3520476 3618267 3622374 3626196 3650864 3756536 3880805 3885210 3911640 3916080 4024860 4107222 4139856 4226103 4400595 4440240 4532745 4563580 4568760 4656966 4662252 4693968 4695670 4791759 4824356 4829832 4834928 5174820 5180280 5366480 5433127 5439294 5476296 5482512 5634804 5827815 5867460 6030445 6037290 6043660 6160833 6209288 6216336 6389012 6660360 6845370 6853140 6899760 6985449 7040952 7043505 7236534 7244748 7252392 7513072 7761610 7770420 7823280 7986265 8049720 8158941 8214444 8442623 8452206 8801190 9055935 9065490 9127160 9137520 9313932 9324504 9391340 9583518 9648712 9659664 10268055 10349640 10360560 10854801 10866254 10878588 10952592 11180771 11269608 11642415 11655630 11734920 12060890 12074580 12087320 12321666 12418576 12678309 12778024 13320720 13598235 13690740 13706280 13970898 14081904 14087010 14375277 14473068 14489496 14504784 15523220 15540840 15972530 16099440 16299381 16317882 16428888 16885246 16904412 17602380 18091335 18111870 18130980 18254320 18627864 18649008 18782680 19167036 19297424 20536110 20699280 20956347 21130515 21709602 21732508 21757176 22361542 22539216 23284830 23311260 23469840 23958795 24121780 24149160 24174640 24643332 25327869 25356618 25556048 27165635 27196470 27381480 27412560 27941796 28174020 28717957 28750554 28946136 28978992 30804165 31046440 31081680 31945060 32564403 32598762 32635764 32857776 33542313 33770492 33808824 34927245 35204760 36182670 36223740 36261960 37255728 37565360 38031889 38334072 40794705 41072220 41912694 42213115 42261030 43125831 43419204 43465016 43514352 44723084 46569660 46622520 47917590 48243560 48298320 48898143 49286664 50655738 50713236 54274005 54331270 54392940 54762960 55883592 55903855 56348040 57435914 57501108 57892272 59098361 61608330 62092880 63391545 63890120 65128806 65197524 65271528 67084626 67540984 67617648 69854490 70409520 71876385 72365340 72447480 72523920 75983607 76063778 76668144 81496905 81589410 82144440 83825388 84426230 84522060 86153871 86251662 86838408 86930032 89446168 93139320 93245040 95835180 96487120 97796286 98573328 100626939 101311476 101426472 104781735 108548010 108662540 108785880 111767184 111807710 112696080 114095667 114871828 115002216 118196722 123216660 126639345 126783090 127780240 130257612 130395048 130543056 134169252 135081968 139708980 143589785 143752770 144730680 144894960 146694429 151967214 152127556 162822015 162993810 163178820 164288880 167650776 167711565 168852460 169044120 172307742 172503324 173676816 177295083 178892336 186278640 190159445 191670360 195592572 201025699 201253878 202622952 202852944 209563470 215629155 217096020 217325080 217571760 223615420 227950821 228191334 229743656 230004432 236393444 244490715 246433320 253278690 253566180 258461613 260515224 260790096 266223223 268338504 279417960 287179570 287505540 289461360 293388858 295491805 301880817 303934428 304255112 325644030 325987620 326357640 335301552 335423130 337704920 338088240 342287001 344615484 345006648 354590166 379918035 380318890 383340720 391185144 402051398 402507756 405245904 413688527 419126940 430769355 431258310 434192040 434650160 447230840 455901642 456382668 459487312 472786888 488981430 492866640 503134695 506557380 507132360 516923226 521030448 531885249 532446446 536677008 558835920 570478335 574359140 575011080 586777716 590983610 603077097 603761634 607868856 608510224 651288060 651975240 652715280 670846260 675409840 683797841 684574002 689230968 690013296 709180332 733472145 759836070 760637780 775384839 782370288 798669669 804102796 805015512 827377054 838253880 861538710 862516620 868384080 886475415 894461680 911803284 912765336 945573776 977962860 1005128495 1006269390 1013114760 1014264720 1026861003 1033846452 1062564409 1063770498 1064892892 1139754105 1140956670 1148718280 1150022160 1173555432 1181967220 1206154194 1207523268 1215737712 1241065581 1292308065 1302576120 1303950480 1331116115 1341692520 1367595682 1369148004 1378461936 1407179893 1418360664 1466944290 1509404085 1519672140 1521275560 1550769678 1595655747 1597339338 1608205592 1610031024 1654754108 1676507760 1711435005 1723077420 1725033240 1772950830 1809231291 1823606568 1825530672 1955925720 2010256990 2012538780 2026229520 2051393523 2053722006 2067692904 2068442635 2125128818 2127540996 2129785784 2279508210 2281913340 2297436560 2347110864 2363934440 2396009007 2412308388 2415046536 2482131162 2584616130 2605152240 2659426245 2662232230 2683385040 2735191364 2738296008 2814359786 2836721328 2933888580 3015385485 3018808170 3039344280 3042551120 3101539356 3187693227 3191311494 3194678676 3216411184 3309508216 3418989205 3422870010 3446154840 3450066480 3545901660 3618462582 3647213136 3723196743 3876924195 3911851440 3993348345 4020513980 4025077560 4102787046 4107444012 4135385808 4136885270 4221539679 4250257636 4255081992 4259571568 4559016420 4563826680 4727868880 4786584887 4792018014 4824616776 4830093072 4964262324 5134305015 5169232260 5312822045 5318852490 5324464460 5427693873 5470382728 5476592016 5628719572 5867777160 6030770970 6037616340 6078688560 6154180569 6203078712 6205327905 6375386454 6382622988 6389357352 6619016432 6837978410 6845740020 6892309680 7035899465 7091803320 7188027021 7236925164 7437950863 7446393486 7753848390 7978278735 7986696690 8041027960 8050155120 8205574092 8214888024 8273770540 8443079358 8500515272 8510163984 9046156455 9118032840 9127653360 9563079681 9573169774 9584036028 9649233552 9850259251 9928524648 10256967615 10268610030 10338464520 10625644090 10637704980 10648928920 10855387746 10940765456 11169590229 11257439144 11735554320 11980045035 12061541940 12075232680 12308361138 12406157424 12410655810 12664619037 12750772908 12765245976 12778714704 13675956820 13691480040 14071798930 14183606640 14359754661 14376054042 14473850328 14875901726 14892786972 15507696780 15938466135 15956557470 15973393380 16082055920 16411148184 16429776048 16547541080 16886158716 17001030544 18092312910 18236065680 18462541707 18615983715 19126159362 19146339548 19168072056 19700518502 19857049296 20513935230 20537220060 20676929040 21107698395 21251288180 21275409960 21297857840 21710775492 22313852589 22339180458 22514878288 23932924435 23960090070 24123083880 24150465360 24616722276 24821311620 25300520117 25329238074 25501545816 25530491952 27138469365 27351913640 27382960080 28143597860 28689239043 28719509322 28752108084 28947700656 29550777753 29751803452 29785573944 30770902845 31015393560 31876932270 31913114940 31946786760 32822296368 33095082160 33506094209 33772317432 35940135105 36184625820 36925083414 37189754315 37231967430 37993857111 38252318724 38292679096 38336144112 39401037004 41027870460 41074440120 42215396790 42502576360 42550819920 43079263983 43421550984 44627705178 44678360916 47815398405 47865848870 47920180140 48246167760 49233444552 49251296255 49642623240 50601040234 50658476148 51003091632 52065656041 54276938730 54703827280 55847951145 56287195720 57378478086 57439018644 57504216168 59101555506 59503606904 59571147888 61541805690 62030787120 63323095185 63753864540 63826229880 63893573520 66941557767 67012188418 67544634864 71798773305 71880270210 72369251640 73850166828 74379508630 74463934860 75901560351 75987714222 76504637448 76585358192 78802074008 82055740920 82148880240 84430793580 85005152720 86158527966 86843101968 88652333259 89255410356 89356721832 92312708535 95630796810 95731697740 95840360280 98466889104 98502592510 99285246480 100518282627 101202080468 101316952296 104131312082 108553877460 111569262945 111695902290 112574391440 114756956172 114878037288 115008432336 118203111012 119007213808 123083611380 126502600585 126646190370 127507729080 127652459760 129237791949 133883115534 134024376836 143446195215 143597546610 143760540420 144738503280 147700333656 147753888765 148759017260 148927869720 151803120702 151975428444 153009274896 156196968123 157604148016 164111481840 167530471045 168861587160 172317055932 177103640819 177304666518 178510820712 178713443664 184625417070 189969285555 191261593620 191463395480 191680720560 197005185020 200824673301 201036565254 202404160936 202633904592 208262624164 215396319915 217107754920 223138525890 223391804580 227704681053 229513912344 229756074576 234542659463 236406222024 246167222760 253005201170 253292380740 255015458160 258475583898 260328280205 265956999777 267766231068 268048753672 286892390430 287195093220 287521080840 295400667312 295507777530 297518034520 297855739440 301554847881 303606241404 303950856888 312393936246 334707788835 335060942090 337723174320 344634111864 354207281638 354609333036 357021641424 364459592287 369250834140 379507801755 379938571110 382523187240 382926790960 394010370040 401649346602 402073130508 404808321872 416525248328 430792639830 434215509840 443261666295 446277051780 446783609160 455409362106 459027824688 468590904369 469085318926 472812444048 492334445520 502591413135 506010402340 506584761480 516951167796 520656560410 531310922457 531913999554 535532462136 536097507344 573784780860 574390186440 575042161680 591015555060 595036069040 603109695762 607212482808 607901713776 624787872492 646188959745 669415577670 670121884180 683114043159 689268223728 703627978389 708414563276 709218666072 728919184574 738501668280 759015603510 759877142220 765046374480 780984840615 788020740080 803298693204 804146261016 833050496656 861585279660 885518204095 886523332590 892554103560 893567218320 904664543643 910818724212 936119244329 937181808738 938170637852 1004123366505 1005182826270 1012020804680 1013169522960 1033902335592 1041313120820 1062621844914 1063827999108 1071064924272 1093378776861 1138523405265 1147569561720 1148780372880 1172713297315 1182031110120 1206219391524 1214424965616 1239725485733 1249575744984 1292377919490 1329784998885 1338831155340 1340243768360 1366228086318 1405772713107 1407255956778 1416829126552 1418437332144 1457838369148 1477003336560 1507774239405 1518031207020 1519754284440 1561969681230 1593932767371 1606597386408 1608292522032 1723170559320 1771036408190 1773046665180 1785108207120 1809329087286 1821637448424 1822297961435 1872238488658 1874363617476 1876341275704 2008246733010 2010365652540 2024041609360 2067804671184 2082626241640 2110883935167 2125243689828 2127655998216 2186757553722 2277046810530 2295139123440 2342954521845 2345426594630 2364062220240 2412438783048 2479450971466 2499151489968 2584755838980 2656554612285 2659569997770 2677662310680 2680487536720 2732456172636 2808357732987 2811545426214 2814511913556 2833658253104 2915676738296 3015548478810 3036062414040 3039508568880 3123939362460 3187865534742 3213194772816 3280136330583 3415570215795 3446341118640 3518139891945 3542072816380 3546093330360 3618658174572 3643274896848 3644595922870 3719176457199 3744476977316 3748727234952 3752682551408 4016493466020 4020731305080 4165252483280 4221767870334 4250487379656 4255311996432 4373515107444 4523322718215 4554093621060 4680596221645 4685909043690 4690853189260 4781798302113 4824877566096 4958901942932 5169511677960 5313109224570 5319139995540 5355324621360 5464912345272 5466893884305 5616715465974 5623090852428 5629023827112 5831353476592 6031096957620 6072124828080 6198627428665 6247878724920 6332651805501 6375731069484 6552834710303 6560272661166 6831140431590 7028863565535 7036279783890 7084145632760 7092186660720 7237316349144 7289191845740 7438352914398 7488953954632 7497454469904 7969663836855 8032986932040 8041462610160 8425073198961 8443535740668 8500974759312 8678078400131 8747030214888 9046645436430 9108187242120 9361192443290 9371818087380 9381706378520 9563596604226 9840408991749 9917803885864 10339023355920 10554419675835 10626218449140 10638279991080 10929824690544 10933787768610 11157529371597 11233430931948 11246181704856 11258047654224 12062193915240 12397254857330 12495757449840 12665303611002 12751462138968 13105669420606 13120545322332 13662280863180 14041788664935 14057727131070 14072559567780 14168291265520 14474632698288 14578383691480 14876705828796 14977907909264 15939327673710 16065973864080 16400681652915 16850146397922 16887071481336 17356156800262 17494060429776 18093290872860 18216374484240 18595882285995 18722384886580 18743636174760 18763412757040 19127193208452 19658504130909 19680817983498 19835607771728 21108839351670 21252436898280 21276559982160 21867575537220 22315058743194 22466861863896 22492363409712 23908991510565 24124387830480 24794509714660 25275219596883 25330607222004 25502924277936 26034235200393 26211338841212 26241090644664 27324561726360 28083577329870 28115454262140 28145119135560 29156767382960 29753411657592 31663259027505 31878655347420 32764173551515 32801363305830 33472588114791 33700292795844 33774142962672 34712313600524 36186581745720 37191764571990 37444769773160 37487272349520 38254386416904 39317008261818 39361635966996 42125365994805 42217678703340 42504873796560 43390392000655 43735151074440 44630117486388 44933723727792 45869842972121 47817983021130 49202044958745 49589019429320 50550439193766 50661214444008 52068470400786 52422677682424 52482181289328 54649123452720 55787646857985 56167154659740 56230908524280 56290238271120 58975512392727 59506823315184 63326518055010 63757310694840 65528347103030 65602726611660 66945176229582 67400585591688 69424627201048 72373163491440 74383529143980 74889539546320 76508772833808 78102705601179 78634016523636 78723271933992 84250731989610 84435357406680 86780784001310 87470302148880 89260234972776 91739685944242 95635966042260 98292520654545 98404089917490 99178038858640 101100878387532 101322428888016 104136940801572 104845355364848 111575293715970 112334309319480 112461817048560 117951024785454 126376097984415 126653036110020 127514621389680 130171176001965 131056694206060 131205453223320 133890352459164 134801171183376 137609528916363 138849254402096 148767058287960 156205411202358 157268033047272 157446543867984 167362940573955 168501463979220 168870714813360 173561568002620 176926537178181 178520469945552 183479371888484 191271932084520 196585041309090 196808179834980 202201756775064 208273881603144 223150587431940 224668618638960 229349214860605 234308116803537 235902049570908 252752195968830 253306072220040 260342352003930 262113388412120 262410906446640 267780704918328 275219057832726 294877561963635 297534116575920 312410822404716 314536066094544 321088900804847 334725881147910 337002927958440 347123136005240 353853074356362 366958743776968 382543864169040 390513528005895 393170082618180 393616359669960 404403513550128 412828586749089 416547763206288 446301174863880 458698429721210 468616233607074 471804099141816 505504391937660 506612144440080 520684704007860 524226776824240 535561409836656 550438115665452 589755123927270 624821644809432 642177801609694 669451762295820 674005855916880 688047644581815 694246272010480 707706148712724 733917487553936 781027056011790 786340165236360 787232719339920 825657173498178 884632685890905 892602349727760 917396859442420 937232467214148 943608198283632 963266702414541 1011008783875320 1041369408015720 1100876231330904 1171540584017685 1179510247854540 1238485760247267 1249643289618864 1284355603219388 1338903524591640 1376095289163630 1415412297425448 1562054112023580 1572680330472720 1605444504024235 1651314346996356 1769265371781810 1834793718884840 1874464934428296 1926533404829082 2022017567750640 2064142933745445 2082738816031440 2201752462661808 2343081168035370 2359020495709080 2476971520494534 2568711206438776 2677807049183280 2752190578327260 2830824594850896 2889800107243623 3124108224047160 3210889008048470 3302628693992712 3538530743563620 3669587437769680 3748929868856592 3853066809658164 4128285867490890 4686162336070740 4718040991418160 4816333512072705 4953943040989068 5137422412877552 5504381156654520 5779600214487246 6192428801236335 6248216448094320 6421778016096940 6605257387985424 7077061487127240 7706133619316328 8256571734981780 8669400321730869 9372324672141480 9632667024145410 9907886081978136 11008762313309040 11559200428974492 12384857602472670 12843556032193880 14154122974254480 14449000536218115 15412267238632656 16513143469963560 17338800643461738 18744649344282960 19265334048290820 19815772163956272 23118400857948984 24769715204945340 25687112064387760 28898001072436230 33026286939927120 34677601286923476 38530668096581640 43347001608654345 46236801715897968 49539430409890680 57796002144872460 69355202573846952 77061336193163280 86694003217308690 99078860819781360 115592004289744920 138710405147693904 173388006434617380 231184008579489840 346776012869234760 693552025738469520
- Sum of all divisors σ(n): 2866473860681088000
- Sum of proper divisors (its aliquot sum) s(n): 2172921834942618480
- 693552025738469520 is an abundant number, because the sum of its proper divisors (2172921834942618480) is greater than itself. Its abundance is 1479369809204148960
Bases of 693552025738469520
- Binary: 1001100111111111110111100100100011110110010011100000100100002
- Hexadecimal: 0x99FFDE48F64E090
- Base-36: 59OZOA461AC0
Squares and roots of 693552025738469520
- 693552025738469520 squared (6935520257384695202) is 481014412405934687538893231969030400
- 693552025738469520 cubed (6935520257384695203) is 333608520133535606802834301149112237549978534353408000
-
The
square root of 693552025738469520 is 832797709.9743187455 -
The
cube root of 693552025738469520 is 885169.3104898655
Scales and comparisons
How big is 693552025738469520?- 693,552,025,738,469,520 seconds is equal to 22,052,809,121 years, 11 weeks, 4 hours, 12 minutes.
-
To count from 1 to 693,552,025,738,469,520 would take you about sixty-six billion, one hundred fifty-eight million, four hundred twenty-seven thousand, three hundred sixty-three 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 693552025738469520 cubic inches would be around 73764.1 feet tall.
Recreational maths with 693552025738469520
- 693552025738469520 backwards is 025964837520255396
- The number of decimal digits it has is: 18
- The sum of 693552025738469520's digits is 81
- 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 693552025738469520 - Facts about the integer". Numbermatics.com. 2024. Web. 9 May 2024.
APA style:
Numbermatics. (2024). Number 693552025738469520 - Facts about the integer. Retrieved 9 May 2024, from https://numbermatics.com/n/693552025738469520/
Chicago style:
Numbermatics. 2024. "Number 693552025738469520 - Facts about the integer". https://numbermatics.com/n/693552025738469520/
The information we have on file for 693552025738469520 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 693552025738469520, math, Factors of 693552025738469520, curriculum, school, college, exams, university, Prime factorization of 693552025738469520, STEM, science, technology, engineering, physics, economics, calculator, six hundred ninety-three quadrillion, five hundred fifty-two trillion, twenty-five billion, seven hundred thirty-eight million, four hundred sixty-nine thousand, five hundred twenty.