81793861056 has 84 divisors (see below), whose sum is σ = 236638609272. Its totient is φ = 27009790464.

The previous prime is 81793861001. The next prime is 81793861073. The reversal of 81793861056 is 65016839718.

81793861056 is a `hidden beast` number, since 8 + 17 + 9 + 3 + 8 + 610 + 5 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81793860993 and 81793861011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 601935 + ... + 725198.

Almost surely, 2^81793861056 is an apocalyptic number.

It is an amenable number.

81793861056 is an abundant number, since it is smaller than the sum of its proper divisors (154844748216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81793861056 is a wasteful number, since it uses less digits than its factorization.

81793861056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327258 (or 1327245 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 81793861056 in words is "eighty-one billion, seven hundred ninety-three million, eight hundred sixty-one thousand, fifty-six".