81645155350302720

Names of 81645155350302720

• Cardinal: 81645155350302720 can be written as Eighty-one quadrillion, six hundred forty-five trillion, one hundred fifty-five billion, three hundred fifty million, three hundred two thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.164515535030272 × 10¹⁶

Factors of 81645155350302720

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 17
• Sum of prime factors: 5252410915

Divisors of 81645155350302720

• Number of divisors d(n): 416
• Complete list of divisors:
  1 2 3 4 5 6 8 10 11 12 15 16 20 22 23 24 30 32 33 40 44 46 48 55 60 64 66 69 80 88 92 96 110 115 120 128 132 138 160 165 176 184 192 220 230 240 253 256 264 276 320 330 345 352 368 384 440 460 480 506 512 528 552 640 660 690 704 736 759 768 880 920 960 1012 1024 1056 1104 1265 1280 1320 1380 1408 1472 1518 1536 1760 1840 1920 2024 2048 2112 2208 2530 2560 2640 2760 2816 2944 3036 3072 3520 3680 3795 3840 4048 4096 4224 4416 5060 5120 5280 5520 5632 5888 6072 6144 7040 7360 7590 7680 8096 8448 8832 10120 10240 10560 11040 11264 11776 12144 12288 14080 14720 15180 15360 16192 16896 17664 20240 20480 21120 22080 22528 23552 24288 28160 29440 30360 30720 32384 33792 35328 40480 42240 44160 45056 47104 48576 56320 58880 60720 61440 64768 67584 70656 80960 84480 88320 94208 97152 112640 117760 121440 129536 135168 141312 161920 168960 176640 194304 225280 235520 242880 259072 282624 323840 337920 353280 388608 471040 485760 518144 647680 675840 706560 777216 971520 1036288 1295360 1413120 1554432 1943040 2590720 3108864 3886080 5181440 7772160 15544320 5252410871 10504821742 15757232613 21009643484 26262054355 31514465226 42019286968 52524108710 57776519581 63028930452 78786163065 84038573936 105048217420 115553039162 120805450033 126057860904 157572326130 168077147872 173329558743 210096434840 231106078324 241610900066 252115721808 288882597905 315144652260 336154295744 346659117486 362416350099 420192869680 462212156648 483221800132 504231443616 577765195810 604027250165 630289304520 672308591488 693318234972 724832700198 840385739360 866647793715 924424313296 966443600264 1008462887232 1155530391620 1208054500330 1260578609040 1328859950363 1344617182976 1386636469944 1449665400396 1680771478720 1733295587430 1812081750495 1848848626592 1932887200528 2016925774464 2311060783240 2416109000660 2521157218080 2657719900726 2689234365952 2773272939888 2899330800792 3361542957440 3466591174860 3624163500990 3697697253184 3865774401056 3986579851089 4033851548928 4622121566480 4832218001320 5042314436160 5315439801452 5378468731904 5546545879776 5798661601584 6644299751815 6723085914880 6933182349720 7248327001980 7395394506368 7731548802112 7973159702178 8067703097856 9244243132960 9664436002640 10084628872320 10630879602904 10756937463808 11093091759552 11597323203168 13288599503630 13446171829760 13866364699440 14496654003960 14790789012736 15463097604224 15946319404356 16135406195712 18488486265920 19328872005280 19932899255445 20169257744640 21261759205808 21513874927616 22186183519104 23194646406336 26577199007260 26892343659520 27732729398880 28993308007920 29581578025472 30926195208448 31892638808712 32270812391424 36976972531840 38657744010560 39865798510890 40338515489280 42523518411616 44372367038208 46389292812672 53154398014520 53784687319040 55465458797760 57986616015840 59163156050944 61852390416896 63785277617424 64541624782848 73953945063680 77315488021120 79731597021780 80677030978560 85047036823232 88744734076416 92778585625344 106308796029040 107569374638080 110930917595520 115973232031680 118326312101888 123704780833792 127570555234848 147907890127360 154630976042240 159463194043560 161354061957120 170094073646464 177489468152832 185557171250688 212617592058080 221861835191040 231946464063360 236652624203776 247409561667584 255141110469696 295815780254720 309261952084480 318926388087120 322708123914240 340188147292928 354978936305664 371114342501376 425235184116160 443723670382080 463892928126720 494819123335168 510282220939392 591631560509440 618523904168960 637852776174240 680376294585856 709957872611328 742228685002752 850470368232320 887447340764160 927785856253440 1020564441878784 1183263121018880 1237047808337920 1275705552348480 1360752589171712 1484457370005504 1700940736464640 1774894681528320 1855571712506880 2041128883757568 2474095616675840 2551411104696960 2721505178343424 3401881472929280 3549789363056640 3711143425013760 4082257767515136 5102822209393920 5443010356686848 6803762945858560 7422286850027520 8164515535030272 10205644418787840 13607525891717120 16329031070060544 20411288837575680 27215051783434240 40822577675151360 81645155350302720
• Sum of all divisors σ(n): 297371502392039424
• Sum of proper divisors (its aliquot sum) s(n): 215726347041736704
• 81645155350302720 is an abundant number, because the sum of its proper divisors (215726347041736704) is greater than itself. Its abundance is 134081191691433984

Bases of 81645155350302720

• Binary: 100100010000011111101011000010010010010010101000000000000₂
• Hexadecimal: 0x1220FD612495000
• Base-36: MBWSIKO4LXC

Squares and roots of 81645155350302720

• 81645155350302720 squared (81645155350302720²) is 6665931392175064865355195639398400
• 81645155350302720 cubed (81645155350302720³) is 544241004068592856079291016544365273365398683648000
• The square root of 81645155350302720 is 285736163.8825276873
• The cube root of 81645155350302720 is 433820.5692725247

Scales and comparisons

• 81,645,155,350,302,720 seconds is equal to 2,596,063,395 years, 4 weeks, 5 days, 16 hours, 32 minutes.
• To count from 1 to 81,645,155,350,302,720 would take you about seven billion, seven hundred eighty-eight million, one hundred ninety thousand, one hundred eighty-five 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 81645155350302720 cubic inches would be around 36151.7 feet tall.

Recreational maths with 81645155350302720

• 81645155350302720 backwards is 02720305355154618
• The number of decimal digits it has is: 17
• The sum of 81645155350302720's digits is 57
• More coming soon!