81123656136640

Names of 81123656136640

• Cardinal: 81123656136640 can be written as Eighty-one trillion, one hundred twenty-three billion, six hundred fifty-six million, one hundred thirty-six thousand, six hundred forty.

Scientific notation

• Scientific notation: 8.112365613664 × 10¹³

Factors of 81123656136640

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 9562

Divisors of 81123656136640

• Number of divisors d(n): 448
• Complete list of divisors:
  1 2 4 5 8 10 13 16 20 26 31 32 40 52 61 62 64 65 80 104 122 124 130 155 160 208 244 248 260 305 310 320 403 416 488 496 520 610 620 793 806 832 976 992 1040 1220 1240 1259 1586 1612 1891 1952 1984 2015 2080 2440 2480 2518 3172 3224 3782 3904 3965 4030 4160 4880 4960 5036 6295 6344 6448 7564 7930 8060 8191 9455 9760 9920 10072 12590 12688 12896 15128 15860 16120 16367 16382 18910 19520 20144 24583 25180 25376 25792 30256 31720 32240 32734 32764 37820 39029 40288 40955 49166 50360 50752 60512 63440 64480 65468 65528 75640 76799 78058 80576 81835 81910 98332 100720 106483 121024 122915 126880 128960 130936 131056 151280 153598 156116 163670 163820 195145 196664 201440 212966 245830 253760 253921 261872 262112 302560 307196 312232 327340 327640 383995 390290 393328 402880 425932 491660 499651 507377 507842 523744 524224 532415 605120 614392 624464 654680 655280 767990 780580 786656 851864 983320 998387 999302 1014754 1015684 1047488 1064830 1228784 1248928 1269605 1309360 1310560 1535980 1561160 1573312 1703728 1966640 1996774 1998604 2029508 2031368 2129660 2380769 2457568 2497856 2498255 2536885 2539210 2618720 2621120 3071960 3122320 3300973 3407456 3933280 3993548 3997208 4059016 4062736 4259320 4761538 4915136 4991935 4996510 5073770 5078420 5237440 6143920 6244640 6495463 6601946 6814912 7866560 7987096 7994416 8118032 8125472 8518640 9523076 9983870 9993020 10147540 10156840 10312469 11903845 12287840 12489280 12990926 13203892 15489181 15974192 15988832 16236064 16250944 16504865 17037280 19046152 19967740 19986040 20295080 20313680 20624938 23807690 24575680 25981852 26407784 30949997 30978362 31948384 31977664 32472128 32477315 33009730 34074560 38092304 39935480 39972080 40590160 40627360 41249876 47615380 51562345 51963704 52815568 61899994 61956724 63896768 64954630 66019460 76184608 77445905 79870960 79944160 81180320 81254720 82499752 95230760 103124690 103927408 105631136 123799988 123913448 129909260 132038920 134062097 152369216 154749985 154891810 159741920 159888320 162360640 164999504 190461520 201359353 206249380 207854816 211262272 247599976 247826896 259818520 264077840 268124194 309499970 309783620 319483840 319686539 329999008 380923040 402718706 412498760 415709632 495199952 495653792 519637040 528155680 536248388 618999940 619567240 629060609 639373078 659998016 670310485 761846080 805437412 824997520 990399904 991307584 1006796765 1039274080 1056311360 1072496776 1237999880 1239134480 1258121218 1278746156 1340620970 1598432695 1610874824 1649995040 1980799808 2013593530 2078548160 2144993552 2475999760 2478268960 2516242436 2557492312 2681241940 3145303045 3196865390 3221749648 3299990080 4027187060 4155925007 4289987104 4951999520 4956537920 5032484872 5114984624 5362483880 6290606090 6393730780 6443499296 8054374120 8177787917 8311850014 8579974208 9903999040 10064969744 10229969248 10724967760 12581212180 12787461560 12886998592 16108748240 16355575834 16623700028 19500878879 20129939488 20459938496 20779625035 21449935520 25162424360 25574923120 32217496480 32711151668 33247400056 39001757758 40259878976 40888939585 41559250070 42899871040 50324848720 51149846240 64434992960 65422303336 66494800112 78003515516 81777879170 83118500140 97504394395 100649697440 102299692480 130844606672 132989600224 156007031032 163555758340 166237000280 195008788790 201299394880 253511425427 261689213344 265979200448 312014062064 327111516680 332474000560 390017577580 507022850854 523378426688 624028124128 654223033360 664948001120 780035155160 1014045701708 1248056248256 1267557127135 1308446066720 1329896002240 1560070310320 2028091403416 2535114254270 2616892133440 3120140620640 4056182806832 5070228508540 6240281241280 8112365613664 10140457017080 16224731227328 20280914034160 40561828068320 81123656136640
• Sum of all divisors σ(n): 218466657239040
• Sum of proper divisors (its aliquot sum) s(n): 137343001102400
• 81123656136640 is an abundant number, because the sum of its proper divisors (137343001102400) is greater than itself. Its abundance is 56219344965760

Bases of 81123656136640

• Binary: 10010011100100000010010101101001111011111000000₂
• Hexadecimal: 0x49C812B4F7C0
• Base-36: SR7OYB9OG

Squares and roots of 81123656136640

• 81123656136640 squared (81123656136640²) is 6581047584975808730350489600
• 81123656136640 cubed (81123656136640³) is 533878641302442617773844382657068498944000
• The square root of 81123656136640 is 9006867.1654821245
• The cube root of 81123656136640 is 43289.4935700723

Scales and comparisons

• 81,123,656,136,640 seconds is equal to 2,579,481 years, 17 weeks, 2 days, 6 hours, 50 minutes, 40 seconds.
• To count from 1 to 81,123,656,136,640 would take you about six million, four hundred forty-eight thousand, seven hundred three 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 81123656136640 cubic inches would be around 3607.5 feet tall.

Recreational maths with 81123656136640

• 81123656136640 backwards is 04663165632118
• 81123656136640 is a Harshad number.
• The number of decimal digits it has is: 14
• The sum of 81123656136640's digits is 52
• More coming soon!