81912058264 has 16 divisors (see below), whose sum is σ = 154078956720. Its totient is φ = 40824336480.

The previous prime is 81912058243. The next prime is 81912058279. The reversal of 81912058264 is 46285021918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16458939 + ... + 16463914.

It is an arithmetic number, because the mean of its divisors is an integer number (9629934795).

Almost surely, 2^81912058264 is an apocalyptic number.

It is an amenable number.

81912058264 is a deficient number, since it is larger than the sum of its proper divisors (72166898456).

81912058264 is a wasteful number, since it uses less digits than its factorization.

81912058264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32923170 (or 32923166 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 81912058264 in words is "eighty-one billion, nine hundred twelve million, fifty-eight thousand, two hundred sixty-four".