235136221495312500
235,136,221,495,312,500 is an even composite number composed of five prime numbers multiplied together.
What does the number 235136221495312500 look like?
This visualization shows the relationship between its 5 prime factors (large circles) and 1944 divisors.
235136221495312500 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one thousand, nine hundred forty-four divisors.
Prime factorization of 235136221495312500:
22 × 32 × 58 × 115 × 473
(2 × 2 × 3 × 3 × 5 × 5 × 5 × 5 × 5 × 5 × 5 × 5 × 11 × 11 × 11 × 11 × 11 × 47 × 47 × 47)See below for interesting mathematical facts about the number 235136221495312500 from the Numbermatics database.
Names of 235136221495312500
- Cardinal: 235136221495312500 can be written as Two hundred thirty-five quadrillion, one hundred thirty-six trillion, two hundred twenty-one billion, four hundred ninety-five million, three hundred twelve thousand, five hundred.
Scientific notation
- Scientific notation: 2.351362214953125 × 1017
Factors of 235136221495312500
Divisors of 235136221495312500
- Number of divisors d(n): 1944
-
Complete list of divisors:
1 2 3 4 5 6 9 10 11 12 15 18 20 22 25 30 33 36 44 45 47 50 55 60 66 75 90 94 99 100 110 121 125 132 141 150 165 180 188 198 220 225 235 242 250 275 282 300 330 363 375 396 423 450 470 484 495 500 517 550 564 605 625 660 705 726 750 825 846 900 940 990 1034 1089 1100 1125 1175 1210 1250 1331 1375 1410 1452 1500 1551 1650 1692 1815 1875 1980 2068 2115 2178 2209 2250 2350 2420 2475 2500 2585 2662 2750 2820 3025 3102 3125 3300 3525 3630 3750 3993 4125 4230 4356 4418 4500 4653 4700 4950 5170 5324 5445 5500 5625 5687 5875 6050 6204 6250 6627 6655 6875 7050 7260 7500 7755 7986 8250 8460 8836 9075 9306 9375 9900 10340 10575 10890 11045 11250 11374 11750 11979 12100 12375 12500 12925 13254 13310 13750 14100 14641 15125 15510 15625 15972 16500 17061 17625 18150 18612 18750 19881 19965 20625 21150 21780 22090 22500 22748 23265 23500 23958 24299 24750 25850 26508 26620 27225 27500 28125 28435 29282 29375 30250 31020 31250 33135 33275 34122 34375 35250 36300 37500 38775 39762 39930 41250 42300 43923 44180 45375 46530 46875 47916 48598 49500 51183 51700 52875 54450 55225 56250 56870 58564 58750 59895 60500 61875 62500 62557 64625 66270 66550 68244 68750 70500 72897 73205 75625 77550 78125 79524 79860 82500 85305 87846 88125 90750 93060 93750 97196 99405 99825 102366 103125 103823 105750 108900 110450 112500 113740 116325 117500 119790 121495 123750 125114 129250 131769 132540 133100 136125 137500 140625 142175 145794 146410 146875 151250 155100 156250 161051 165675 166375 170610 171875 175692 176250 181500 187500 187671 193875 198810 199650 204732 206250 207646 211500 218691 219615 220900 226875 232650 234375 239580 242990 247500 250228 255915 258500 263538 264375 267289 272250 276125 281250 284350 291588 292820 293750 299475 302500 309375 311469 312500 312785 322102 323125 331350 332750 341220 343750 352500 364485 366025 375342 378125 387750 390625 397620 399300 412500 415292 426525 437382 439230 440625 453750 465300 468750 483153 485980 497025 499125 511830 515625 519115 527076 528750 534578 544500 552250 562500 563013 568700 581625 587500 598950 607475 618750 622938 625570 644204 646250 658845 662700 665500 680625 687500 688127 703125 710875 728970 732050 734375 750684 756250 775500 781250 801867 805255 828375 831875 853050 859375 874764 878460 881250 907500 934407 937500 938355 966306 969375 994050 998250 1023660 1031250 1038230 1057500 1069156 1093455 1098075 1104500 1126026 1134375 1142053 1163250 1171875 1197900 1214950 1237500 1245876 1251140 1279575 1292500 1317690 1321875 1336445 1361250 1376254 1380625 1406250 1421750 1449459 1457940 1464100 1468750 1497375 1512500 1546875 1557345 1562500 1563925 1603734 1610510 1615625 1656750 1663750 1706100 1718750 1762500 1822425 1830125 1868814 1876710 1890625 1932612 1938750 1988100 1996500 2062500 2064381 2076460 2132625 2186910 2196150 2203125 2252052 2268750 2284106 2326500 2343750 2405601 2415765 2429900 2485125 2495625 2559150 2578125 2595575 2635380 2643750 2672890 2722500 2752508 2761250 2812500 2815065 2843500 2898918 2908125 2937500 2940179 2994750 3037375 3093750 3114690 3127850 3207468 3221020 3231250 3294225 3313500 3327500 3403125 3426159 3437500 3440635 3515625 3554375 3644850 3660250 3671875 3737628 3753420 3781250 3877500 4009335 4026275 4128762 4141875 4159375 4265250 4296875 4373820 4392300 4406250 4537500 4568212 4672035 4687500 4691775 4811202 4831530 4846875 4970250 4991250 5118300 5156250 5191150 5287500 5345780 5467275 5490375 5522500 5630130 5671875 5710265 5797836 5816250 5880358 5989500 6074750 6187500 6193143 6229380 6255700 6397875 6462500 6588450 6609375 6682225 6806250 6852318 6881270 6903125 7031250 7108750 7247295 7289700 7320500 7343750 7486875 7562500 7569397 7734375 7786725 7819625 8018670 8052550 8078125 8257524 8283750 8318750 8530500 8593750 8812500 8820537 9112125 9150625 9344070 9383550 9453125 9622404 9663060 9693750 9940500 9982500 10278477 10312500 10321905 10382300 10663125 10934550 10980750 11015625 11260260 11343750 11420530 11632500 11760716 12028005 12078825 12149500 12386286 12425625 12478125 12562583 12795750 12890625 12977875 13176900 13218750 13364450 13612500 13704636 13762540 13806250 14062500 14075325 14217500 14494590 14540625 14687500 14700895 14973750 15138794 15186875 15468750 15573450 15639250 16037340 16105100 16156250 16471125 16567500 16637500 17015625 17130795 17187500 17203175 17641074 17771875 18224250 18301250 18359375 18688140 18767100 18906250 19387500 20046675 20131375 20556954 20643810 20709375 20796875 21326250 21869100 21961500 22031250 22687500 22708191 22841060 23360175 23458875 24056010 24157650 24234375 24772572 24851250 24956250 25125166 25591500 25781250 25955750 26437500 26461611 26728900 27336375 27451875 27612500 28150650 28359375 28551325 28989180 29081250 29401790 29947500 30277588 30373750 30937500 30965715 31146900 31278500 31989375 32312500 32341969 32942250 33046875 33411125 34031250 34261590 34406350 34515625 35282148 35543750 36236475 36448500 36602500 36718750 37434375 37687749 37812500 37846985 38671875 38933625 39098125 40093350 40262750 40390625 41113908 41287620 41418750 41593750 42652500 44062500 44102685 45416382 45560625 45753125 46720350 46917750 47265625 48112020 48315300 48468750 49702500 49912500 50250332 51392385 51562500 51609525 51911500 52923222 53315625 54672750 54903750 55078125 56301300 56718750 57102650 58162500 58803580 60140025 60394125 60747500 61931430 62128125 62390625 62812915 63978750 64683938 64889375 65884500 66093750 66822250 68062500 68124573 68523180 68812700 69031250 70376625 71087500 72472950 72703125 73437500 73504475 74868750 75375498 75693970 75934375 77343750 77867250 78196250 80186700 80525500 80781250 82355625 82837500 83187500 85078125 85653975 86015875 88205370 88859375 90832764 91121250 91506250 93440700 93835500 94531250 96937500 97025907 100233375 100656875 102784770 103219050 103546875 103984375 105846444 106631250 109345500 109807500 110156250 113063247 113437500 113540955 114205300 116800875 117294375 120280050 120788250 121171875 123862860 124256250 124781250 125625830 127957500 129367876 129778750 132187500 132308055 133644500 136249146 136681875 137259375 138062500 138188413 140753250 141796875 142756625 144945900 145406250 147008950 149737500 150750996 151387940 151868750 154687500 154828575 155734500 156392500 159946875 161562500 161709845 164711250 165234375 167055625 170156250 171307950 172031750 172578125 176410740 177718750 181182375 182242500 183012500 187171875 188438745 189062500 189234925 194051814 194668125 195490625 200466750 201313750 201953125 205569540 206438100 207093750 207968750 213262500 220312500 220513425 226126494 227081910 227803125 228765625 233601750 234588750 240560100 241576500 242343750 248512500 249562500 251251660 256961925 258047625 259557500 264616110 266578125 272498292 273363750 274518750 276376826 281506500 283593750 285513250 290812500 291077721 294017900 300700125 301970625 303737500 309657150 310640625 311953125 314064575 319893750 323419690 324446875 329422500 330468750 334111250 340312500 340622865 342615900 344063500 345156250 351883125 355437500 355761659 362364750 363515625 367522375 374343750 376877490 378469850 379671875 388103628 389336250 390981250 400933500 402627500 403906250 411778125 414187500 414565239 415937500 425390625 428269875 430079375 441026850 444296875 452252988 454163820 455606250 457531250 467203500 469177500 484687500 485129535 501166875 503284375 513923850 516095250 517734375 519921875 529232220 533156250 546727500 549037500 552753652 565316235 567187500 567704775 571026500 582155442 584004375 586471875 601400250 603941250 605859375 619314300 621281250 623906250 628129150 639787500 646839380 648893750 660937500 661540275 668222500 681245730 683409375 686296875 690312500 690942065 703766250 711523318 713783125 724729500 727031250 735044750 748687500 753754980 756939700 759343750 774142875 778672500 781962500 799734375 807812500 808549225 823556250 829130478 835278125 850781250 856539750 860158750 862890625 882053700 888593750 905911875 911212500 915062500 935859375 942193725 946174625 970259070 973340625 977453125 1002333750 1006568750 1027847700 1032190500 1035468750 1039843750 1066312500 1067284977 1102567125 1130632470 1135409550 1139015625 1143828125 1164310884 1168008750 1172943750 1202800500 1207882500 1211718750 1242562500 1243695717 1247812500 1256258300 1284809625 1290238125 1297787500 1323080550 1332890625 1362491460 1366818750 1372593750 1381884130 1407532500 1423046636 1427566250 1454062500 1455388605 1470089500 1503500625 1509853125 1518687500 1520072543 1548285750 1553203125 1559765625 1570322875 1599468750 1617098450 1622234375 1647112500 1658260956 1670556250 1701562500 1703114325 1713079500 1720317500 1725781250 1759415625 1777187500 1778808295 1811823750 1817578125 1837611875 1871718750 1884387450 1892349250 1898359375 1940518140 1946681250 1954906250 2004667500 2013137500 2058890625 2070937500 2072826195 2079687500 2134569954 2141349375 2150396875 2205134250 2221484375 2261264940 2270819100 2278031250 2287656250 2336017500 2345887500 2423437500 2425647675 2487391434 2505834375 2516421875 2569619250 2580476250 2588671875 2646161100 2665781250 2733637500 2745187500 2763768260 2826581175 2838523875 2855132500 2910777210 2920021875 2932359375 3007001250 3019706250 3040145086 3096571500 3106406250 3119531250 3140645750 3198937500 3201854931 3234196900 3244468750 3307701375 3341112500 3406228650 3417046875 3431484375 3451562500 3454710325 3518831250 3557616590 3568915625 3623647500 3635156250 3675223750 3743437500 3768774900 3784698500 3796718750 3870714375 3893362500 3909812500 3998671875 4042746125 4117781250 4145652390 4176390625 4269139908 4282698750 4300793750 4410268500 4442968750 4529559375 4556062500 4560217629 4575312500 4679296875 4710968625 4730873125 4851295350 4866703125 4887265625 4974782868 5011668750 5032843750 5139238500 5160952500 5177343750 5331562500 5336424885 5512835625 5653162350 5677047750 5695078125 5719140625 5821554420 5840043750 5864718750 6014002500 6039412500 6080290172 6212812500 6218478585 6239062500 6281291500 6403709862 6424048125 6451190625 6488937500 6615402750 6664453125 6812457300 6834093750 6862968750 6909420650 7037662500 7115233180 7137831250 7270312500 7276943025 7350447500 7517503125 7549265625 7593437500 7600362715 7741428750 7766015625 7851614375 7997343750 8085492250 8111171875 8235562500 8291304780 8352781250 8515571625 8565397500 8601587500 8797078125 8885937500 8894041475 9059118750 9120435258 9188059375 9358593750 9421937250 9461746250 9491796875 9702590700 9733406250 9774531250 10023337500 10065687500 10294453125 10354687500 10364130975 10672849770 10706746875 10751984375 11025671250 11306324700 11354095500 11390156250 11438281250 11680087500 11729437500 12128238375 12436957170 12529171875 12582109375 12807419724 12848096250 12902381250 13230805500 13328906250 13668187500 13680652887 13725937500 13818841300 14132905875 14192619375 14275662500 14553886050 14600109375 14661796875 15035006250 15098531250 15200725430 15482857500 15532031250 15703228750 15994687500 16009274655 16170984500 16222343750 16538506875 16705562500 16720797973 17031143250 17085234375 17157421875 17273551625 17594156250 17788082950 17844578125 18118237500 18240870516 18376118750 18717187500 18843874500 18923492500 18983593750 19353571875 19466812500 19549062500 19993359375 20213730625 20588906250 20728261950 20881953125 21345699540 21413493750 21503968750 22051342500 22647796875 22780312500 22801088145 22876562500 23554843125 23654365625 24256476750 24333515625 24436328125 24873914340 25058343750 25164218750 25696192500 25804762500 26657812500 26682124425 27361305774 27564178125 28265811750 28385238750 28475390625 29107772100 29200218750 29323593750 30070012500 30197062500 30401450860 31064062500 31092392925 31406457500 32018549310 32120240625 32255953125 32444687500 33077013750 33441595946 34062286500 34170468750 34314843750 34547103250 35188312500 35576165900 35689156250 36384715125 36752237500 37587515625 37746328125 37967187500 38001813575 38707143750 39258071875 39986718750 40427461250 40555859375 41177812500 41456523900 41763906250 42577858125 42826987500 43007937500 43985390625 44470207375 45295593750 45602176290 45940296875 47109686250 47308731250 48512953500 48667031250 48872656250 50116687500 50162393919 50328437500 51472265625 51820654875 53364248850 53533734375 53759921875 54722611548 55128356250 56531623500 56770477500 56950781250 58400437500 58647187500 60641191875 62184785850 62645859375 62910546875 64037098620 64240481250 64511906250 66154027500 66883191892 68340937500 68403264435 68629687500 69094206500 70664529375 70963096875 71378312500 72769430250 73000546875 73308984375 75175031250 75492656250 76003627150 77414287500 78516143750 79973437500 80046373275 80854922500 81111718750 82692534375 83527812500 83603989865 85155716250 85426171875 86367758125 87970781250 88940414750 89222890625 90591187500 91204352580 91880593750 94219372500 94617462500 96767859375 97334062500 97745312500 100324787838 101068653125 102944531250 103641309750 104409765625 106728497700 107067468750 107519843750 110256712500 113238984375 113901562500 114005440725 117774215625 118271828125 121282383750 121667578125 124369571700 125291718750 125821093750 128480962500 129023812500 133410622125 136806528870 137820890625 141329058750 141926193750 145538860500 146001093750 146617968750 150350062500 150487181757 150985312500 152007254300 155461964625 157032287500 160092746550 160601203125 161279765625 162223437500 165385068750 167207979730 170311432500 170852343750 172735516250 175941562500 177880829500 178445781250 181923575625 183761187500 187937578125 188731640625 190009067875 193535718750 196290359375 200649575676 202137306250 205889062500 207282619500 208819531250 212889290625 214134937500 215039687500 219926953125 222351036875 226477968750 228010881450 229701484375 235548431250 236543656250 242564767500 243335156250 250583437500 250811969595 251642187500 259103274375 266821244250 267668671875 268799609375 273613057740 275641781250 282658117500 283852387500 292002187500 293235937500 300974363514 303205959375 310923929250 313229296875 320185493100 321202406250 322559531250 330770137500 334415959460 341704687500 342016322175 345471032500 353322646875 354815484375 356891562500 363847151250 365002734375 375875156250 377463281250 380018135750 387071437500 392580718750 400231866375 404274612500 413462671875 417639062500 418019949325 425778581250 431838790625 439853906250 444702073750 446114453125 452955937500 456021762900 459402968750 471096862500 473087312500 483839296875 486670312500 501623939190 505343265625 518206548750 533642488500 535337343750 537599218750 551283562500 566194921875 570027203625 588871078125 591359140625 601948727028 606411918750 621847858500 626458593750 642404812500 645119062500 667053110625 684032644350 689104453125 706645293750 709630968750 727694302500 730005468750 751750312500 752435908785 754926562500 760036271500 777309823125 785161437500 800463732750 803006015625 806398828125 826925343750 836039898650 851557162500 863677581250 879707812500 889404147500 892228906250 909617878125 918805937500 939687890625 950045339375 967678593750 981451796875 1003247878380 1010686531250 1036413097500 1064446453125 1070674687500 1075198437500 1111755184375 1132389843750 1140054407250 1148507421875 1177742156250 1182718281250 1212823837500 1252917187500 1254059847975 1295516371875 1334106221250 1338343359375 1368065288700 1378208906250 1413290587500 1419261937500 1460010937500 1504871817570 1516029796875 1554619646250 1600927465500 1606012031250 1612797656250 1653850687500 1672079797300 1710081610875 1727355162500 1766613234375 1774077421875 1784457812500 1819235756250 1879375781250 1900090678750 1935357187500 1962903593750 2001159331875 2021373062500 2067313359375 2090099746625 2128892906250 2159193953125 2223510368750 2264779687500 2280108814500 2297014843750 2355484312500 2365436562500 2419196484375 2508119695950 2526716328125 2591032743750 2668212442500 2676686718750 2756417812500 2850136018125 2944355390625 2956795703125 3009743635140 3032059593750 3109239292500 3212024062500 3225595312500 3335265553125 3420163221750 3445522265625 3533226468750 3548154843750 3638471512500 3758751562500 3762179543925 3800181357500 3886549115625 3925807187500 4002318663750 4015030078125 4134626718750 4180199493250 4257785812500 4318387906250 4447020737500 4548089390625 4594029687500 4750226696875 4838392968750 4907258984375 5016239391900 5053432656250 5182065487500 5322232265625 5353373437500 5558775921875 5700272036250 5888710781250 5913591406250 6064119187500 6270299239875 6477581859375 6670531106250 6840326443500 6891044531250 7066452937500 7096309687500 7524359087850 7580148984375 7773098231250 8004637327500 8030060156250 8269253437500 8360398986500 8550408054375 8636775812500 8833066171875 8870387109375 9096178781250 9500453393750 9676785937500 9814517968750 10005796659375 10106865312500 10336566796875 10450498733125 10644464531250 10795969765625 11117551843750 11400544072500 11777421562500 11827182812500 12540598479750 12633581640625 12955163718750 13341062212500 13782089062500 14250680090625 14721776953125 15048718175700 15160297968750 15546196462500 16060120312500 16676327765625 17100816108750 17666132343750 17740774218750 18192357562500 18810897719625 19000906787500 19432745578125 19629035937500 20011593318750 20673133593750 20900997466250 21288929062500 21591939531250 22235103687500 22740446953125 23751133484375 25081196959500 25267163281250 25910327437500 26611161328125 27793879609375 28501360181250 29443553906250 30320595937500 31351496199375 32387909296875 33352655531250 34201632217500 35332264687500 35481548437500 37621795439250 37900744921875 38865491156250 40023186637500 41346267187500 41801994932500 42752040271875 43183879062500 44165330859375 45480893906250 47502266968750 50028983296875 50534326562500 52252493665625 53222322656250 53979848828125 55587759218750 57002720362500 58887107812500 62702992398750 64775818593750 66705311062500 71253400453125 75243590878500 75801489843750 77730982312500 83381638828125 85504080543750 88330661718750 90961787812500 94054488598125 95004533937500 97163727890625 100057966593750 104504987331250 106444645312500 107959697656250 111175518437500 113702234765625 118755667421875 125405984797500 129551637187500 138969398046875 142506800906250 151602979687500 156757480996875 161939546484375 166763277656250 171008161087500 176661323437500 188108977196250 194327455781250 200115933187500 209009974662500 213760201359375 215919395312500 227404469531250 237511334843750 250144916484375 261262468328125 277938796093750 285013601812500 313514961993750 323879092968750 333526555312500 356267002265625 376217954392500 388654911562500 416908194140625 427520402718750 454808939062500 470272442990625 475022669687500 485818639453125 500289832968750 522524936656250 555877592187500 593778337109375 627029923987500 647758185937500 712534004531250 783787404984375 833816388281250 855040805437500 940544885981250 971637278906250 1000579665937500 1045049873312500 1068801006796875 1187556674218750 1250724582421875 1306312341640625 1425068009062500 1567574809968750 1667632776562500 1781335011328125 1881089771962500 1943274557812500 2137602013593750 2351362214953125 2375113348437500 2501449164843750 2612624683281250 3135149619937500 3562670022656250 3918937024921875 4275204027187500 4702724429906250 5002898329687500 5225249366562500 5344005033984375 6531561708203125 7125340045312500 7837874049843750 9405448859812500 10688010067968750 11756811074765625 13063123416406250 15675748099687500 19594685124609375 21376020135937500 23513622149531250 26126246832812500 39189370249218750 47027244299062500 58784055373828125 78378740498437500 117568110747656250 235136221495312500
- Sum of all divisors σ(n): 835027146528382080
- Sum of proper divisors (its aliquot sum) s(n): 599890925033069580
- 235136221495312500 is an abundant number, because the sum of its proper divisors (599890925033069580) is greater than itself. Its abundance is 364754703537757080
Bases of 235136221495312500
- Binary: 11010000110101111100100101110011000000111001000000011101002
- Hexadecimal: 0x3435F25CC0E4074
- Base-36: 1SB8U0X4Z910
Squares and roots of 235136221495312500
- 235136221495312500 squared (2351362214953125002) is 55289042659092660173459472656250000
- 235136221495312500 cubed (2351362214953125003) is 13000456580952193344106298139210102081298828125000000
-
The
square root of 235136221495312500 is 484908467.1309756581 -
The
cube root of 235136221495312500 is 617219.7936410761
Scales and comparisons
How big is 235136221495312500?- 235,136,221,495,312,500 seconds is equal to 7,476,604,519 years, 24 weeks, 15 hours, 15 minutes.
-
To count from 1 to 235,136,221,495,312,500 would take you about twenty-two billion, four hundred twenty-nine million, eight hundred thirteen thousand, five hundred fifty-eight 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 235136221495312500 cubic inches would be around 51435 feet tall.
Recreational maths with 235136221495312500
- 235136221495312500 backwards is 005213594122631532
- The number of decimal digits it has is: 18
- The sum of 235136221495312500'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 235136221495312500 - Facts about the integer". Numbermatics.com. 2024. Web. 30 May 2024.
APA style:
Numbermatics. (2024). Number 235136221495312500 - Facts about the integer. Retrieved 30 May 2024, from https://numbermatics.com/n/235136221495312500/
Chicago style:
Numbermatics. 2024. "Number 235136221495312500 - Facts about the integer". https://numbermatics.com/n/235136221495312500/
The information we have on file for 235136221495312500 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 235136221495312500, math, Factors of 235136221495312500, curriculum, school, college, exams, university, Prime factorization of 235136221495312500, STEM, science, technology, engineering, physics, economics, calculator, two hundred thirty-five quadrillion, one hundred thirty-six trillion, two hundred twenty-one billion, four hundred ninety-five million, three hundred twelve thousand, five hundred.