81074112756 has 48 divisors (see below), whose sum is σ = 232828224384. Its totient is φ = 21382183296.

The previous prime is 81074112709. The next prime is 81074112809. The reversal of 81074112756 is 65721147018.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37120755 + ... + 37122938.

It is an arithmetic number, because the mean of its divisors is an integer number (4850588008).

Almost surely, 2^81074112756 is an apocalyptic number.

It is an amenable number.

81074112756 is an abundant number, since it is smaller than the sum of its proper divisors (151754111628).

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

81074112756 is a wasteful number, since it uses less digits than its factorization.

81074112756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74243720 (or 74243718 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The spelling of 81074112756 in words is "eighty-one billion, seventy-four million, one hundred twelve thousand, seven hundred fifty-six".