| Base | Representation |
|---|---|
| bin | 10010011100000111111010… |
| … | …001110100000100000000000 |
| 3 | 101122010211202111212011000000 |
| 4 | 102130013322032200200000 |
| 5 | 41112200112224413122 |
| 6 | 444251355504000000 |
| 7 | 23040046022030040 |
| oct | 2234077216404000 |
| 9 | 348124674764000 |
| 10 | 81097475622912 |
| 11 | 23927278867281 |
| 12 | 9119298600000 |
| 13 | 36335c7954528 |
| 14 | 16051d2aa3720 |
| 15 | 9597e89960ac |
| hex | 49c1fa3a0800 |
81097475622912 has 1344 divisors, whose sum is σ = 287010878394240. Its totient is φ = 22417525702656.
The previous prime is 81097475622893. The next prime is 81097475622913. The reversal of 81097475622912 is 21922657479018.
81097475622912 is a `hidden beast` number, since 8 + 1 + 0 + 9 + 7 + 47 + 562 + 29 + 1 + 2 = 666.
It is a tau number, because it is divible by the number of its divisors (1344).
It is a Harshad number since it is a multiple of its sum of digits (63).
It is a self number, because there is not a number n which added to its sum of digits gives 81097475622912.
It is not an unprimeable number, because it can be changed into a prime (81097475622913) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 50781136098 + ... + 50781137694.
It is an arithmetic number, because the mean of its divisors is an integer number (213549760710).
Almost surely, 281097475622912 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 81097475622912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143505439197120).
81097475622912 is an abundant number, since it is smaller than the sum of its proper divisors (205913402771328).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81097475622912 is a wasteful number, since it uses less digits than its factorization.
81097475622912 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1800 (or 1765 counting only the distinct ones).
The product of its (nonzero) digits is 30481920, while the sum is 63.
The spelling of 81097475622912 in words is "eighty-one trillion, ninety-seven billion, four hundred seventy-five million, six hundred twenty-two thousand, nine hundred twelve".
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