| Base | Representation |
|---|---|
| bin | 10010100101101111101000… |
| … | …001111100000000000000000 |
| 3 | 101201111001020022212012100000 |
| 4 | 102211233220033200000000 |
| 5 | 41204013102301403304 |
| 6 | 445515214245200000 |
| 7 | 23135602203553620 |
| oct | 2245575017400000 |
| 9 | 351431208765300 |
| 10 | 81758598856704 |
| 11 | 24061699681020 |
| 12 | 9205445400000 |
| 13 | 3680a58965ba3 |
| 14 | 16291cca66880 |
| 15 | 96bade98b939 |
| hex | 4a5be83e0000 |
81758598856704 has 3456 divisors, whose sum is σ = 338345763904512. Its totient is φ = 19079721123840.
The previous prime is 81758598856657. The next prime is 81758598856763. The reversal of 81758598856704 is 40765889585718.
It is a happy number.
81758598856704 is a `hidden beast` number, since 8 + 17 + 5 + 8 + 598 + 8 + 5 + 6 + 7 + 0 + 4 = 666.
It is a tau number, because it is divible by the number of its divisors (3456).
It is a super-2 number, since 2×817585988567042 (a number of 29 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (81).
It is a congruent number.
It is an unprimeable number.
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 191 ways as a sum of consecutive naturals, for example, 1542615072742 + ... + 1542615072794.
It is an arithmetic number, because the mean of its divisors is an integer number (97900973352).
Almost surely, 281758598856704 is an apocalyptic number.
81758598856704 is a gapful number since it is divisible by the number (84) 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 81758598856704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169172881952256).
81758598856704 is an abundant number, since it is smaller than the sum of its proper divisors (256587165047808).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81758598856704 is an equidigital number, since it uses as much as digits as its factorization.
81758598856704 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 174 (or 130 counting only the distinct ones).
The product of its (nonzero) digits is 5419008000, while the sum is 81.
The spelling of 81758598856704 in words is "eighty-one trillion, seven hundred fifty-eight billion, five hundred ninety-eight million, eight hundred fifty-six thousand, seven hundred four".
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