| Base | Representation |
|---|---|
| bin | 10010100101011111011100… |
| … | …111110001100101110000000 |
| 3 | 101201102101101212002220201000 |
| 4 | 102211133130332030232000 |
| 5 | 41203222014323341340 |
| 6 | 445503222544212000 |
| 7 | 23134415610104043 |
| oct | 2245373476145600 |
| 9 | 351371355086630 |
| 10 | 81741229902720 |
| 11 | 240552963218a3 |
| 12 | 9201bb860a000 |
| 13 | 367c21b3b131b |
| 14 | 1628421d84c5a |
| 15 | 96b424bd4d30 |
| hex | 4a57dcf8cb80 |
81741229902720 has 512 divisors, whose sum is σ = 305279005248000. Its totient is φ = 20613690114048.
The previous prime is 81741229902691. The next prime is 81741229902749. The reversal of 81741229902720 is 2720992214718.
81741229902720 is a `hidden beast` number, since 8 + 1 + 74 + 12 + 299 + 0 + 272 + 0 = 666.
It is an interprime number because it is at equal distance from previous prime (81741229902691) and next prime (81741229902749).
It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (54).
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 184623052 + ... + 185065268.
It is an arithmetic number, because the mean of its divisors is an integer number (596248057125).
Almost surely, 281741229902720 is an apocalyptic number.
81741229902720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 81741229902720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152639502624000).
81741229902720 is an abundant number, since it is smaller than the sum of its proper divisors (223537775345280).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81741229902720 is a wasteful number, since it uses less digits than its factorization.
81741229902720 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 442827 (or 442809 counting only the distinct ones).
The product of its (nonzero) digits is 2032128, while the sum is 54.
The spelling of 81741229902720 in words is "eighty-one trillion, seven hundred forty-one billion, two hundred twenty-nine million, nine hundred two thousand, seven hundred twenty".
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