16071129849959533944
16,071,129,849,959,533,944 is an even composite number composed of five prime numbers multiplied together.
What does the number 16071129849959533944 look like?
This visualization shows the relationship between its 5 prime factors (large circles) and 1800 divisors.
16071129849959533944 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one thousand, eight hundred divisors.
Prime factorization of 16071129849959533944:
23 × 32 × 75 × 234 × 834
(2 × 2 × 2 × 3 × 3 × 7 × 7 × 7 × 7 × 7 × 23 × 23 × 23 × 23 × 83 × 83 × 83 × 83)See below for interesting mathematical facts about the number 16071129849959533944 from the Numbermatics database.
Names of 16071129849959533944
- Cardinal: 16071129849959533944 can be written as Sixteen quintillion, seventy-one quadrillion, one hundred twenty-nine trillion, eight hundred forty-nine billion, nine hundred fifty-nine million, five hundred thirty-three thousand, nine hundred forty-four.
Scientific notation
- Scientific notation: 1.6071129849959533944 × 1019
Factors of 16071129849959533944
Divisors of 16071129849959533944
- Number of divisors d(n): 1800
-
Complete list of divisors:
1 2 3 4 6 7 8 9 12 14 18 21 23 24 28 36 42 46 49 56 63 69 72 83 84 92 98 126 138 147 161 166 168 184 196 207 249 252 276 294 322 332 343 392 414 441 483 498 504 529 552 581 588 644 664 686 747 828 882 966 996 1029 1058 1127 1162 1176 1288 1372 1449 1494 1587 1656 1743 1764 1909 1932 1992 2058 2116 2254 2324 2401 2744 2898 2988 3087 3174 3381 3486 3528 3703 3818 3864 4067 4116 4232 4508 4648 4761 4802 5229 5727 5796 5976 6174 6348 6762 6889 6972 7203 7406 7636 7889 8134 8232 9016 9522 9604 10143 10458 11109 11454 11592 12167 12201 12348 12696 13363 13524 13778 13944 14406 14812 15272 15778 16268 16807 17181 19044 19208 20286 20667 20916 21609 22218 22908 23667 24334 24402 24696 25921 26726 27048 27556 28469 28812 29624 31556 32536 33327 33614 34362 36501 36603 38088 40089 40572 41334 41832 43218 43907 44436 45816 47334 48223 48668 48804 50421 51842 53452 55112 55223 56938 57624 62001 63112 66654 67228 68724 71001 73002 73206 77763 80178 81144 82668 85169 85407 86436 87814 88872 93541 94668 96446 97336 97608 100842 103684 106904 109503 110446 113876 120267 124002 131721 133308 134456 137448 142002 144669 146004 146412 151263 155526 158447 160356 165336 165669 170338 170814 172872 175628 181447 187082 189336 192892 199283 201684 207368 219006 220892 227752 233289 240534 248004 255507 256221 263442 266616 279841 280623 284004 289338 292008 292824 302526 307349 311052 316894 320712 331338 337561 340676 341628 351256 362894 374164 385784 386561 395163 398566 403368 434007 438012 441784 466578 475341 481068 496008 497007 511014 512442 526884 544341 559682 561246 568008 571787 578676 596183 597849 605052 614698 622104 633788 654787 662676 675122 681352 683256 725788 748328 766521 773122 790326 797132 839523 841869 868014 876024 922047 933156 950682 962136 994014 1009861 1012683 1022028 1024884 1053768 1088682 1109129 1119364 1122492 1143574 1157352 1159683 1192366 1195698 1210104 1229396 1267576 1270129 1309574 1325352 1350244 1394981 1426023 1451576 1533042 1546244 1580652 1594264 1633023 1679046 1683738 1715361 1736028 1788549 1793547 1844094 1866312 1901364 1958887 1964361 1988028 2019722 2025366 2044056 2049768 2151443 2177364 2218258 2238728 2244984 2287148 2319366 2362927 2384732 2391396 2458792 2518569 2540258 2619148 2700488 2766141 2789962 2852046 3029583 3038049 3066084 3092488 3161304 3266046 3327387 3358092 3367476 3430722 3472056 3479049 3577098 3587094 3644281 3688188 3802728 3810387 3917774 3928722 3976056 4002509 4039444 4050732 4173281 4184943 4302886 4354728 4436516 4574296 4583509 4638732 4725854 4769464 4782792 5037138 5080516 5146083 5238296 5365647 5532282 5579924 5704092 5876661 5893083 6059166 6076098 6132168 6454329 6532092 6654774 6716184 6734952 6861444 6958098 7069027 7088781 7154196 7174188 7288562 7376376 7620774 7763903 7835548 7857444 8005018 8078888 8101464 8346562 8369886 8605772 8873032 8890903 9088749 9167018 9277464 9451708 9982161 10074276 10161032 10292166 10731294 10932843 11064564 11159848 11408184 11431161 11753322 11786166 12007527 12118332 12152196 12519843 12554829 12908658 13064184 13151101 13309548 13712209 13722888 13750527 13916196 14138054 14177562 14308392 14348376 14577124 15060101 15241548 15527806 15671096 15714888 16010036 16540489 16693124 16739772 17211544 17629983 17781806 18177498 18334036 18903416 19362987 19964322 20148552 20584332 21207081 21266343 21462588 21865686 22129128 22862322 23226803 23291709 23506644 23572332 24015054 24236664 24304392 25039686 25109658 25509967 25817316 26302202 26619096 26672709 27424418 27501054 27832392 28017563 28276108 28355124 29154248 29212967 30120202 30483096 31055612 32020072 32084563 32798529 33080978 33386248 33479544 35259966 35563612 36022581 36354996 36668072 37559529 38725974 39453303 39928644 41136627 41168664 41251581 42414162 42532686 42925176 43731372 45180303 45724644 46453606 46583418 47013288 47144664 47458321 48030108 49483189 49621467 50079372 50219316 51019934 51634632 52604404 53345418 54347321 54848836 55002108 56035126 56552216 56710248 58425934 60240404 62111224 63621243 64169126 65597058 66161956 69680409 69875127 70519932 71127224 72045162 72709992 75119058 76529901 77451948 78906606 79857288 80018127 82273254 82503162 83818463 84052689 84828324 85065372 87462744 87638901 90360606 91449288 92057707 92907212 93166836 94916642 95985463 96060216 96253689 98966378 99242934 100158744 100438632 102039868 105208808 105420707 106690836 108694642 109697672 110004216 112070252 115783423 116851868 118359909 120480808 123409881 127242486 128338252 131194116 132323912 135540909 139360818 139750254 141039864 142374963 144090324 148449567 148864401 150238116 153059802 154903896 157813212 160036254 162587621 163041963 164546508 165006324 167636926 168105378 169656648 170130744 175277802 178569769 180721212 184115414 185814424 186333672 189833284 191970926 192507378 196122941 197932756 198485868 204079736 204490769 209041227 210841414 213381672 217389284 224140504 229589703 231566846 233703736 236719818 246819762 251455389 252158067 254484972 256676504 262388232 262916703 271081818 276173121 278721636 279500508 284749926 287956389 288180648 288761067 296899134 297728802 300476232 302475323 306119604 315626424 316262121 320072508 325175242 326083926 329093016 330012648 332208247 335273852 336210756 346382323 347350269 350555604 357139538 361442424 368230828 379666568 380431247 383941852 385014756 392245882 395865512 396971736 408981538 418082454 421682828 427124889 434778568 445348701 459179406 463133692 473439636 487762863 489125889 493639524 502910778 504316134 508969944 525833406 535709307 542163636 552346242 557443272 559001016 569499852 575912778 577522134 586729241 588368823 593798268 595457604 604950646 612239208 613472307 632524242 640145016 644403949 650350484 652167852 664416494 670547704 671898241 672421512 692764646 694700538 701111208 714279076 736461656 737944949 754366167 760862494 767883704 770029512 784491764 817963076 828519363 836164908 843365656 854249778 863869167 890697402 907425969 918358812 926267384 946879272 948786363 975525726 978251778 987279048 996624741 1005821556 1008632268 1039146969 1042050807 1051666812 1071418614 1084327272 1091541383 1104692484 1138113347 1138999704 1141293741 1151825556 1155044268 1173458482 1176737646 1187596536 1190915208 1209901292 1226944614 1249988383 1265048484 1288807898 1300700968 1304335704 1328832988 1343796482 1372860587 1385529292 1389401076 1428558152 1463288589 1475889898 1508732334 1521724988 1568983528 1607127921 1635926152 1657038726 1672329816 1708499556 1727738334 1760187723 1765106469 1781394804 1814851938 1836717624 1840416921 1897572726 1927824649 1933211847 1951051452 1956503556 1993249482 2011643112 2015694723 2017264536 2078293938 2084101614 2103333624 2117327261 2142837228 2183082766 2209384968 2213834847 2276226694 2282587482 2303651112 2310088536 2325457729 2346916964 2353475292 2419802584 2424676261 2453889228 2499976766 2530096968 2577615796 2657665976 2663018729 2687592964 2722277907 2745721174 2771058584 2778802152 2926577178 2951779796 2989874223 3017464668 3043449976 3117440907 3214255842 3274624149 3314077452 3414340041 3416999112 3423881223 3455476668 3520375446 3530212938 3562789608 3629703876 3680833842 3749965149 3795145452 3855649298 3866423694 3902102904 3913007112 3986498964 4031389446 4107104687 4118581761 4156587876 4168203228 4234654522 4285674456 4366165532 4427669694 4510827643 4552453388 4565174964 4650915458 4693833928 4703287687 4706950584 4849352522 4907778456 4999953532 5155231592 5280563169 5326037458 5375185928 5444555814 5491442348 5783473947 5799635541 5853154356 5903559592 5979748446 6034929336 6047084169 6234881814 6351981783 6428511684 6549248298 6628154904 6641504541 6828680082 6847762446 6910953336 6956932429 6976373187 7040750892 7060425876 7259407752 7274028783 7361667684 7499930298 7590290904 7640789681 7711298596 7732847388 7966793429 7972997928 7989056187 8062778892 8214209374 8237163522 8313175752 8336406456 8469309044 8732331064 8749918681 8855339388 9021655286 9104906776 9130349928 9301830916 9406575374 9610024109 9698705044 9823872447 9999907064 10243020123 10561126338 10652074916 10889111628 10982884696 11249895447 11566947894 11599271082 11706308712 11959496892 12094168338 12321314061 12355745283 12469763628 12703963566 12857023368 13098496596 13283009082 13494772543 13532482929 13657360164 13695524892 13913864858 13952746374 14081501784 14109863061 14120851752 14548057566 14723335368 14821290827 14999860596 15281579362 15422597192 15465694776 15933586858 15978112374 16125557784 16278204103 16428418748 16474327044 16938618088 16972733827 17350421841 17499837362 17710678776 18043310572 18603661832 18813150748 19055945349 19220048218 19397410088 19647744894 20486040246 20870797287 20929119561 21122252676 21304149832 21778223256 21822086349 22499790894 22922369043 23133895788 23198542164 23900380287 23918993784 23967168561 24188336676 24642628122 24711490566 24939527256 25105451809 25407927132 26196993192 26249756043 26566018164 26989545086 27064965858 27314720328 27391049784 27827729716 27905492748 28219726122 28749732809 28830072327 29096115132 29642581654 29999721192 30563158724 31575793501 31867173716 31956224748 32556408206 32856837496 32948654088 33945467654 34700843682 34999674724 36086621144 36963942183 37626301496 38111890698 38440096436 39295489788 40484317629 40597448787 40972080492 41741594574 41858239122 42244505352 42329589183 43644172698 44463872481 44999581788 45844738086 46267791576 46397084328 47800760574 47934337122 48376673352 48698527003 48834612309 49285256244 49422981132 50210903618 50815854264 50918201481 52499512086 53132036328 53485527767 53979090172 54129931716 55655459432 55767554003 55810985496 56439452244 57499465618 57660144654 58192230264 59285163308 61126317448 61249430767 62612391861 63151587002 63734347432 63912449496 65112816412 67890935308 68767107129 69401687364 69999349448 71701140861 73927884366 75316355427 76223781396 76880192872 78590979576 78749268129 80968635258 81194897574 81944160984 83483189148 83716478244 84659178366 86249198427 86490216981 87288345396 88927744962 89999163576 91689476172 94463407801 94727380503 95601521148 95868674244 97397054006 97669224618 98570512488 98845962264 100421807236 101836402962 103749035789 104999024172 106971055534 107958180344 108259863432 111535108006 112878904488 113947428721 114998931236 115320289308 118570326616 121452952887 122498861534 125224783722 126303174004 130225632824 133391617443 135781870616 137534214258 138803374728 143402281722 146095581009 146503836927 147855768732 150632710854 152447562792 152754604443 157498536258 160009445867 160456583301 161937270516 162389795148 166966378296 167302662009 167432956488 169318356732 172498396854 172980433962 174576690792 175738162663 177855489924 183378952344 183748292301 188926815602 189454761006 191203042296 191737348488 194794108012 195338449236 200843614472 201248129663 203672805924 207498071578 209998048344 213942111068 221030554507 223070216012 225949066281 227894857442 229997862472 230640578616 242905905774 244997723068 250449567444 252606348008 258747595281 266783234886 275068428516 283390223403 284182141509 286804563444 292191162018 293007673854 295711537464 301265421708 305509208886 311247107367 314997072516 320018891734 320913166602 323874541032 324779590296 334605324018 338636713464 340889689021 341842286163 344996793708 345960867924 351476325326 355710979848 367496584602 374398694369 377853631204 378909522012 389588216024 390372878021 390676898472 402496259326 407345611848 414996143156 427884222136 438286743027 442061109014 446140432024 451898132562 455789714884 480028337601 481369749903 485811811548 489995446136 500899134888 501907986027 517495190562 527214487989 533566469772 550136857032 551244876903 566780446806 568364283018 573609126888 577425391607 584382324036 586015347708 602530843416 603744388989 611018417772 622494214734 629994145032 640037783468 641826333204 661243854607 663091663521 669210648036 681779378042 683684572326 689993587416 691921735848 702952650652 726243250523 734993169204 748797388738 755707262408 757819044024 780745756042 797632001047 804992518652 829992286312 850170670209 876573486054 884122218028 903796265124 911579429768 933741322101 960056675202 962739499806 971623623096 1003815972054 1022669067063 1025526858489 1034990381124 1054428975978 1067132939544 1102489753806 1120066121069 1123196083107 1133560893612 1136728566036 1154850783214 1168764648072 1171118634063 1172030695416 1207488777978 1222036835544 1230167138641 1244988429468 1280075566936 1283652666408 1322487709214 1326183327042 1338421296072 1363558756084 1367369144652 1405905301304 1408736907641 1440085012803 1452486501046 1469986338408 1497594777476 1561491512084 1581643463967 1595264002094 1609985037304 1700341340418 1732276174821 1753146972108 1768244436056 1807592530248 1811233166967 1867482644202 1920113350404 1925478999612 1983731563821 1989274990563 2007631944108 2045338134126 2051053716978 2069980762248 2108857951956 2178729751569 2204979507612 2240132242138 2246392166214 2267121787224 2273457132072 2309701566428 2342237268126 2386227823147 2392896003141 2414977555956 2460334277282 2489976858936 2620790860583 2644975418428 2652366654084 2727117512168 2734738289304 2817473815282 2880170025606 2904973002092 2995189554952 3068007201189 3122983024168 3163286927934 3190528004188 3360198363207 3369588249321 3400682680836 3464552349642 3506293944216 3513355902189 3622466333934 3690501415923 3734965288404 3840226700808 3850957999224 3967463127642 3978549981126 4015263888216 4041977741249 4090676268252 4102107433956 4217715903912 4226210722923 4357459503138 4409959015224 4480264484276 4492784332428 4619403132856 4628706982249 4684474536252 4772455646294 4785792006282 4829955111912 4920668554564 5083702753661 5196828524463 5241581721166 5289950836856 5304733308168 5634947630564 5760340051212 5809946004184 5951194691463 6136014402378 6326573855868 6381056008376 6536189254707 6720396726414 6739176498642 6801365361672 6929104699284 7026711804378 7158683469441 7178688009423 7244932667868 7381002831846 7469930576808 7840462847483 7862372581749 7934926255284 7957099962252 8083955482498 8181352536504 8204214867912 8452421445846 8611169970487 8714919006276 8960528968552 8985568664856 9257413964498 9368949072504 9544911292588 9571584012564 9841337109128 10080595089621 10167405507322 10393657048926 10483163442332 11071504247769 11269895261128 11520680102424 11902389382926 12125933223747 12272028804756 12653147711736 12678632168769 13072378509414 13280784006961 13440793452828 13478352997284 13858209398568 13886120946747 14053423608756 14317366938882 14357376018846 14489865335736 14762005663692 15251108260983 15680925694966 15724745163498 15869852510568 15914199924504 16167910964996 16703594762029 16904842891692 17222339940974 17429838012552 18345536024081 18514827928996 19089822585176 19143168025128 20161190179242 20334811014644 20787314097852 20966326884664 21476050408323 22143008495538 23521388542449 23587117745247 23804778765852 24251866447494 24544057609512 25357264337538 25833509911461 26144757018828 26561568013922 26881586905656 26956705994568 27772241893494 28106847217512 28293844188743 28634733877764 28714752037692 29524011327384 30502216521966 31361851389932 31449490326996 32335821929992 32400948875743 33407189524058 33809685783384 34444679881948 36377799671241 36691072048162 37029655857992 39842352020883 40322380358484 40669622029288 41574628195704 41658362840241 42952100816646 44286016991076 45753324782949 47042777084898 47174235490494 47609557531704 48503732894988 50110784286087 50714528675076 51667019822922 52289514037656 53123136027844 54883239932381 55036608072243 55544483786988 56587688377486 57269467755528 57429504075384 60278189793409 61004433043932 62723702779864 62898980653992 64801897751486 66814379048116 68889359763896 70564165627347 72755599342482 73382144096324 77500529734383 79684704041766 80644760716968 83316725680482 84881532566229 85904201633292 88572033982152 91506649565898 92965488048727 94085554169796 94348470980988 97007465789976 97202846627229 100221568572174 101429057350152 103334039645844 106246272055688 109766479864762 110073216144486 111088967573976 113175376754972 116925163334203 119527056062649 120556379586818 122008866087864 129603795502972 133628758096232 141128331254694 145511198684964 146764288192648 150332352858261 155001059468766 159369408083532 164649719797143 165109824216729 166633451360964 169763065132458 171808403266584 180834569380227 183013299131796 185930976097454 188171108339592 188696941961976 194405693254458 198056909321201 200443137144348 206668079291688 219532959729524 220146432288972 226350753509944 233850326668406 239054112125298 241112759173636 254644597698687 259207591005944 278896464146181 282256662509388 291022397369928 291608539881687 300664705716522 310002118937532 318738816167064 329299439594286 330219648433458 333266902721928 339526130264916 350775490002609 361669138760454 366026598263592 371861952194908 384182679526667 388811386508916 396113818642402 400886274288696 421947328553863 439065919459048 440292864577944 467700653336812 478108224250596 482225518347272 493949159391429 509289195397374 542503708140681 557792928292362 564513325018776 583217079763374 594170727963603 601329411433044 620004237875064 650758416341089 658598879188572 660439296866916 679052260529832 701550980005218 723338277520908 743723904389816 768365359053334 777622773017832 792227637284804 836689392438543 843894657107726 935401306673624 956216448501192 987898318782858 1018578390794748 1052326470007827 1085007416281362 1115585856584724 1152548038580001 1166434159526748 1188341455927206 1202658822866088 1265841985661589 1301516832682178 1317197758377144 1320878593733832 1386398365248407 1403101960010436 1446676555041816 1536730718106668 1584455274569608 1673378784877086 1687789314215452 1782512183890809 1952275249023267 1975796637565716 2037156781589496 2104652940015654 2170014832562724 2231171713169448 2305096077160002 2332868319053496 2376682911854412 2531683971323178 2603033665364356 2689278756686669 2772796730496814 2806203920020872 3073461436213336 3346757569754172 3375578628430904 3457644115740003 3565024367781618 3797525956984767 3904550498046534 3951593275131432 4159195095745221 4209305880031308 4340029665125448 4555308914387623 4610192154320004 4753365823708824 5063367942646356 5206067330728712 5378557513373338 5545593460993628 5856825747069801 6693515139508344 6915288231480006 7130048735563236 7595051913969534 7809100996093068 8067836270060007 8318390191490442 8418611760062616 9110617828775246 9220384308640008 9704788556738849 10126735885292712 10757115026746676 11091186921987256 11713651494139602 12477585287235663 13665926743162869 13830576462960012 14260097471126472 15190103827939068 15618201992186136 16135672540120014 16636780382980884 18221235657550492 19409577113477698 21514230053493352 23427302988279204 24203508810180021 24955170574471326 27331853486325738 27661152925920024 29114365670216547 30380207655878136 31887162400713361 32271345080240028 33273560765961768 36442471315100984 38819154226955396 40997780229488607 46854605976558408 48407017620360042 49910341148942652 54663706972651476 58228731340433094 63774324801426722 64542690160480056 77638308453910792 81995560458977214 87343097010649641 95661487202140083 96814035240720084 99820682297885304 109327413945302952 116457462680866188 127548649602853444 163991120917954428 174686194021299282 191322974404280166 193628070481440168 223210136804993527 232914925361732376 255097299205706888 286984461606420249 327982241835908856 349372388042598564 382645948808560332 446420273609987054 573968923212840498 669630410414980581 698744776085197128 765291897617120664 892840547219974108 1147937846425680996 1339260820829961162 1785681094439948216 2008891231244941743 2295875692851361992 2678521641659922324 4017782462489883486 5357043283319844648 8035564924979766972 16071129849959533944
- Sum of all divisors σ(n): 53735457500142429960
- Sum of proper divisors (its aliquot sum) s(n): 37664327650182896016
- 16071129849959533944 is an abundant number, because the sum of its proper divisors (37664327650182896016) is greater than itself. Its abundance is 21593197800223362072
Bases of 16071129849959533944
- Binary: 11011111000010000001111101110011001101100000001111001101011110002
- Hexadecimal: 0xDF081F733603CD78
- Base-36: 3E3MS2HXHN1Q0
Squares and roots of 16071129849959533944
- 16071129849959533944 squared (160711298499595339442) is 258281214654260352019014894301688195136
- 16071129849959533944 cubed (160711298499595339443) is 4150870938513889350908350715363074888465148214201087696384
-
The
square root of 16071129849959533944 is 4008881371.4001982107 -
The
cube root of 16071129849959533944 is 2523570.6631179931
Scales and comparisons
How big is 16071129849959533944?- 16,071,129,849,959,533,944 seconds is equal to 293,274,701,009 years, 3 weeks, 3 days, 15 hours, 30 minutes, 7 seconds.
-
To count from 1 to 16,071,129,849,959,533,944 would take you about two hundred ninety-three billion, two hundred seventy-four million, seven hundred one thousand and 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 16071129849959533944 cubic inches would be around 210297.6 feet tall.
Recreational maths with 16071129849959533944
- 16071129849959533944 backwards is 44933595994892117061
- The number of decimal digits it has is: 20
- The sum of 16071129849959533944's digits is 99
- 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 16071129849959533944 - Facts about the integer". Numbermatics.com. 2024. Web. 31 May 2024.
APA style:
Numbermatics. (2024). Number 16071129849959533944 - Facts about the integer. Retrieved 31 May 2024, from https://numbermatics.com/n/16071129849959533944/
Chicago style:
Numbermatics. 2024. "Number 16071129849959533944 - Facts about the integer". https://numbermatics.com/n/16071129849959533944/
The information we have on file for 16071129849959533944 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 16071129849959533944, math, Factors of 16071129849959533944, curriculum, school, college, exams, university, Prime factorization of 16071129849959533944, STEM, science, technology, engineering, physics, economics, calculator, sixteen quintillion, seventy-one quadrillion, one hundred twenty-nine trillion, eight hundred forty-nine billion, nine hundred fifty-nine million, five hundred thirty-three thousand, nine hundred forty-four.