668721212640

Names of 668721212640

• Cardinal: 668721212640 can be written as Six hundred sixty-eight billion, seven hundred twenty-one million, two hundred twelve thousand, six hundred forty.

Scientific notation

• Scientific notation: 6.6872121264 × 10¹¹

Factors of 668721212640

• Number of distinct prime factors ω(n): 8
• Total number of prime factors Ω(n): 15
• Sum of prime factors: 249

Divisors of 668721212640

• Number of divisors d(n): 1920
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 13 15 16 17 18 20 24 26 27 29 30 32 34 36 39 40 45 48 51 52 54 58 60 65 68 72 78 80 81 83 85 87 90 96 97 102 104 108 116 117 120 130 135 136 144 145 153 156 160 162 166 170 174 180 194 195 204 208 216 221 232 234 240 249 255 260 261 270 272 288 290 291 306 312 324 332 340 348 351 360 377 388 390 405 408 415 416 432 435 442 459 464 468 480 485 493 498 510 520 522 540 544 580 582 585 612 624 648 663 664 680 696 702 720 747 754 765 776 780 783 810 816 830 864 870 873 884 918 928 936 970 986 996 1020 1040 1044 1053 1079 1080 1105 1131 1160 1164 1170 1224 1245 1248 1261 1296 1305 1326 1328 1360 1377 1392 1404 1411 1440 1455 1479 1494 1508 1530 1552 1560 1566 1620 1632 1649 1660 1740 1746 1755 1768 1836 1872 1885 1940 1972 1989 1992 2040 2080 2088 2106 2158 2160 2210 2241 2262 2295 2320 2328 2340 2349 2407 2448 2465 2490 2522 2592 2610 2619 2652 2656 2720 2754 2784 2808 2813 2822 2910 2958 2988 3016 3060 3104 3120 3132 3237 3240 3298 3315 3320 3393 3480 3492 3510 3536 3672 3735 3744 3770 3783 3880 3915 3944 3978 3984 4080 4176 4212 4233 4316 4320 4365 4420 4437 4482 4524 4590 4640 4656 4680 4698 4814 4896 4930 4947 4980 5044 5220 5238 5265 5304 5395 5508 5616 5626 5644 5655 5820 5916 5967 5976 6032 6120 6240 6264 6305 6409 6474 6480 6596 6630 6640 6723 6786 6885 6960 6984 7020 7055 7072 7221 7344 7395 7470 7540 7566 7760 7830 7857 7888 7956 7968 8051 8160 8245 8352 8424 8439 8466 8632 8730 8840 8874 8964 9048 9180 9312 9360 9396 9628 9711 9860 9894 9945 9960 10088 10179 10440 10476 10530 10608 10790 11016 11205 11232 11252 11288 11310 11349 11640 11745 11832 11934 11952 12035 12064 12240 12528 12610 12699 12818 12948 12960 13095 13192 13260 13280 13311 13446 13572 13770 13920 13968 14040 14065 14110 14442 14688 14790 14841 14940 15080 15132 15520 15660 15714 15776 15912 16102 16185 16490 16848 16878 16932 16965 17264 17460 17680 17748 17901 17928 18096 18343 18360 18720 18792 18915 19227 19256 19422 19720 19788 19890 19920 20176 20358 20880 20952 21060 21165 21216 21437 21580 21663 22032 22185 22410 22504 22576 22620 22698 23280 23490 23664 23868 23904 24070 24153 24480 24735 25056 25220 25317 25398 25636 25896 26190 26384 26520 26622 26892 27144 27540 27936 28080 28130 28220 28884 29133 29580 29682 29835 29880 30160 30264 30537 31291 31320 31428 31824 32045 32204 32370 32980 33615 33696 33756 33864 33930 34047 34528 34920 35360 35496 35802 35856 36105 36192 36569 36686 36720 37584 37830 38097 38454 38512 38844 39285 39440 39576 39780 39840 39933 40255 40352 40716 40919 41760 41904 42120 42195 42330 42874 43160 43326 44064 44370 44523 44820 45008 45152 45240 45396 46560 46980 47328 47736 47821 48140 48306 48555 49470 50440 50634 50796 50895 51272 51792 52380 52768 53040 53244 53784 54288 55029 55080 56160 56260 56440 56745 57681 57768 58266 59160 59364 59670 59760 60320 60528 61074 62582 62640 62856 63495 63648 64090 64311 64408 64740 64989 65960 66555 67230 67512 67728 67860 68094 69840 70992 71604 71712 72210 72459 73138 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88385040 88689816 89520912 90428832 91056810 92607840 94558995 94786848 95259432 95750460 96080634 97127264 98544240 99467680 100711026 100862928 101382840 103197718 103293360 104340960 106062048 106756260 107166861 109268172 110862270 111901140 112069920 113036040 114900552 118253088 118483560 118862640 119074290 121409080 123952032 126078660 127012576 127667280 128107512 132577560 134281368 135177120 135643248 136585215 138911760 142341680 142889148 143625690 144120951 145690896 147816360 149201520 150714720 151294392 153200736 154796577 154940040 157978080 158765720 160134390 163902258 167851710 168104880 169554060 170810016 172350828 176770080 177379632 178611435 179041824 182113620 189117990 190518864 191500920 192161268 197088480 201422052 201725856 202765680 206395436 206586720 213512520 214333722 215438535 218536344 221724540 223802280 226072080 229801104 236967120 237725280 238148580 240201585 242818160 245853387 251777565 252157320 255334560 256215024 257994295 265155120 268562736 271286496 273170430 277823520 284683360 285778296 287251380 288241902 291381792 295632720 298403040 302588784 309593154 309880080 317531440 320268780 321500583 327804516 335703420 336209760 339108120 344701656 354759264 357222870 364227240 378235980 381037728 383001840 384322536 402844104 405531360 409755645 412790872 427025040 428667444 430877070 437072688 443449080 447604560 452144160 459602208 464389731 473934240 476297160 480403170 485636320 491706774 503555130 504314640 512430048 515988590 530310240 535834305 537125472 546340860 571556592 574502760 576483804 591265440 605177568 619186308 619760160 635062880 640537560 643001166 655609032 671406840 678216240 689403312 714445740 720604755 728454480 756471960 766003680 768645072 773982885 805688208 819511290 825581744 854050080 857334888 861754140 874145376 886898160 895209120 928779462 952594320 960806340 983413548 1007110260 1008629280 1031977180 1071668610 1092681720 1143113184 1149005520 1152967608 1229266935 1238372616 1281075120 1286002332 1311218064 1342813680 1356432480 1378806624 1393169193 1428891480 1441209510 1456908960 1512943920 1537290144 1547965770 1607502915 1611376416 1639022580 1651163488 1714669776 1723508280 1773796320 1857558924 1905188640 1921612680 1966827096 2014220520 2063954360 2143337220 2185363440 2298011040 2305935216 2321948655 2458533870 2476745232 2562150240 2572004664 2622436128 2685627360 2786338386 2857782960 2882419020 3025887840 3095931540 3215005830 3278045160 3429339552 3447016560 3715117848 3843225360 3933654192 4028441040 4127908720 4179507579 4286674440 4370726880 4611870432 4643897310 4917067740 4953490464 5144009328 5572676772 5715565920 5764838040 6191863080 6430011660 6556090320 6894033120 6965845965 7430235696 7686450720 7867308384 8056882080 8255817440 8359015158 8573348880 9287794620 9834135480 10288018656 11145353544 11529676080 12383726160 12860023320 13112180640 13931691930 14860471392 16718030316 17146697760 18575589240 19668270960 20897537895 22290707088 23059352160 24767452320 25720046640 27863383860 33436060632 37151178480 39336541920 41795075790 44581414176 51440093280 55726767720 66872121264 74302356960 83590151580 111453535440 133744242528 167180303160 222907070880 334360606320 668721212640
• Sum of all divisors σ(n): 2846455032960
• Sum of proper divisors (its aliquot sum) s(n): 2177733820320
• 668721212640 is an abundant number, because the sum of its proper divisors (2177733820320) is greater than itself. Its abundance is 1509012607680

Bases of 668721212640

• Binary: 1001101110110010111000111110110011100000₂
• Hexadecimal: 0x9BB2E3ECE0
• Base-36: 8J7FCE00

Squares and roots of 668721212640

• 668721212640 squared (668721212640²) is 447188060234712095769600
• 668721212640 cubed (668721212640³) is 299044141918286035704322726047744000
• The square root of 668721212640 is 817753.7603949003
• The cube root of 668721212640 is 8744.7695004399

Scales and comparisons

• 668,721,212,640 seconds is equal to 21,263 years, 13 weeks, 5 days, 20 hours, 24 minutes.
• To count from 1 to 668,721,212,640 would take you about forty-two thousand, five hundred twenty-six 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 668721212640 cubic inches would be around 728.7 feet tall.

Recreational maths with 668721212640

• 668721212640 backwards is 046212127866
• 668721212640 is a Harshad number.
• The number of decimal digits it has is: 12
• The sum of 668721212640's digits is 45
• More coming soon!