81179744904 has 48 divisors (see below), whose sum is σ = 232794860220. Its totient is φ = 25468154880.

The previous prime is 81179744897. The next prime is 81179744911. The reversal of 81179744904 is 40944797118.

81179744904 is a `hidden beast` number, since 8 + 11 + 79 + 74 + 490 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (81179744897) and next prime (81179744911).

It can be written as a sum of positive squares in 2 ways, for example, as 73331556804 + 7848188100 = 270798^2 + 88590^2 .

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, 33160437 + ... + 33162884.

Almost surely, 2^81179744904 is an apocalyptic number.

It is an amenable number.

81179744904 is an abundant number, since it is smaller than the sum of its proper divisors (151615115316).

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

81179744904 is a wasteful number, since it uses less digits than its factorization.

81179744904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66323350 (or 66323343 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 81179744904 in words is "eighty-one billion, one hundred seventy-nine million, seven hundred forty-four thousand, nine hundred four".