81438380143329664

Names of 81438380143329664

• Cardinal: 81438380143329664 can be written as Eighty-one quadrillion, four hundred thirty-eight trillion, three hundred eighty billion, one hundred forty-three million, three hundred twenty-nine thousand, six hundred sixty-four.

Scientific notation

• Scientific notation: 8.1438380143329664 × 10¹⁶

Factors of 81438380143329664

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 1420772111

Divisors of 81438380143329664

• Number of divisors d(n): 384
• Complete list of divisors:
  1 2 4 7 8 13 14 16 19 26 28 32 37 38 49 52 56 64 74 76 91 98 104 112 128 133 148 152 182 196 208 224 247 259 266 296 304 364 392 416 448 481 494 518 532 592 608 637 703 728 784 832 896 931 962 988 1036 1064 1184 1216 1274 1406 1456 1568 1664 1729 1813 1862 1924 1976 2072 2128 2368 2432 2548 2812 2912 3136 3367 3458 3626 3724 3848 3952 4144 4256 4736 4921 5096 5624 5824 6272 6734 6916 7252 7448 7696 7904 8288 8512 9139 9842 10192 11248 11648 12103 13468 13832 14504 14896 15392 15808 16576 17024 18278 19684 20384 22496 23569 24206 26936 27664 29008 29792 30784 31616 33152 34447 36556 39368 40768 44992 47138 48412 53872 55328 58016 59584 61568 63973 68894 73112 78736 81536 89984 94276 96824 107744 110656 116032 119168 127946 137788 146224 157472 188552 193648 215488 221312 232064 255892 275576 292448 314944 377104 387296 430976 447811 511784 551152 584896 629888 754208 774592 895622 1023568 1102304 1169792 1508416 1549184 1791244 2047136 2204608 3016832 3582488 4094272 4409216 7164976 8188544 14329952 28659904 57319808 1420772033 2841544066 5683088132 9945404231 11366176264 18470036429 19890808462 22732352528 26994668627 36940072858 39781616924 45464705056 52568565221 53989337254 69617829617 73880145716 79563233848 90929410112 105137130442 107978674508 129290255003 139235659234 147760291432 159126467696 181858820224 188962680389 210274260884 215957349016 258580510006 278471318468 295520582864 318252935392 350930692151 367979956547 377925360778 420548521768 431914698032 517161020012 556942636936 591041165728 636505870784 683391347873 701861384302 735959913094 755850721556 841097043536 863829396064 905031785021 998802739199 1034322040024 1113885273872 1182082331456 1273011741568 1322738762723 1366782695746 1403722768604 1471919826188 1511701443112 1682194087072 1727658792128 1810063570042 1997605478398 2068644080048 2227770547744 2364164662912 2456514845057 2575859695829 2645477525446 2733565391492 2807445537208 2943839652376 3023402886224 3364388174144 3455317584256 3620127140084 3995210956796 4137288160096 4455541095488 4783739435111 4913029690114 5151719391658 5290955050892 5467130782984 5614891074416 5887679304752 6046805772448 6728776348288 6991619174393 7240254280168 7990421913592 8274576320192 8911082190976 9567478870222 9826059380228 10303438783316 10581910101784 10934261565968 11229782148832 11775358609504 12093611544896 12984435609587 13983238348786 14480508560336 15980843827184 16549152640384 17195603915399 19134957740444 19652118760456 20606877566632 21163820203568 21868523131936 22459564297664 23550717219008 24187223089792 25968871219174 27966476697572 28961017120672 31961687654368 33486176045777 34391207830798 38269915480888 39304237520912 41213755133264 42327640407136 43737046263872 44919128595328 47101434438016 48941334220751 51937742438348 55932953395144 57922034241344 63923375308736 66972352091554 68782415661596 76539830961776 78608475041824 82427510266528 84655280814272 87474092527744 90891049267109 97882668441502 103875484876696 111865906790288 115844068482688 127846750617472 133944704183108 137564831323192 153079661923552 157216950083648 164855020533056 169310561628544 181782098534218 195765336883004 207750969753392 223731813580576 267889408366216 275129662646384 306159323847104 314433900167296 329710041066112 363564197068436 391530673766008 415501939506784 447463627161152 535778816732432 550259325292768 612318647694208 636237344869763 727128394136872 783061347532016 831003879013568 894927254322304 1071557633464864 1100518650585536 1272474689739526 1454256788273744 1566122695064032 1662007758027136 2143115266929728 2201037301171072 2544949379479052 2908513576547488 3132245390128064 4286230533859456 5089898758958104 5817027153094976 6264490780256128 10179797517916208 11634054306189952 20359595035832416 40719190071664832 81438380143329664
• Sum of all divisors σ(n): 219725804910981600
• Sum of proper divisors (its aliquot sum) s(n): 138287424767651936
• 81438380143329664 is an abundant number, because the sum of its proper divisors (138287424767651936) is greater than itself. Its abundance is 56849044624322272

Bases of 81438380143329664

• Binary: 100100001010100111100011001110111100001101100000110000000₂
• Hexadecimal: 0x12153C67786C180
• Base-36: M9VHVCSO9DS

Squares and roots of 81438380143329664

• 81438380143329664 squared (81438380143329664²) is 6632209760369471304752032582352896
• 81438380143329664 cubed (81438380143329664³) is 540116419655270341046768673181786871894172913106944
• The square root of 81438380143329664 is 285374105.5935693407
• The cube root of 81438380143329664 is 433454.0271217001

Scales and comparisons

• 81,438,380,143,329,664 seconds is equal to 2,589,488,583 years, 5 weeks, 4 days, 12 hours, 1 minute, 4 seconds.
• To count from 1 to 81,438,380,143,329,664 would take you about seven billion, seven hundred sixty-eight million, four hundred sixty-five thousand, seven hundred forty-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 81438380143329664 cubic inches would be around 36121.2 feet tall.

Recreational maths with 81438380143329664

• 81438380143329664 backwards is 46692334108383418
• The number of decimal digits it has is: 17
• The sum of 81438380143329664's digits is 73
• More coming soon!