85644631564 has 24 divisors (see below), whose sum is σ = 153948063920. Its totient is φ = 41659759296.

The previous prime is 85644631543. The next prime is 85644631613. The reversal of 85644631564 is 46513644658.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328182 + ... + 1391170.

Almost surely, 2^85644631564 is an apocalyptic number.

It is an amenable number.

85644631564 is a deficient number, since it is larger than the sum of its proper divisors (68303432356).

85644631564 is a wasteful number, since it uses less digits than its factorization.

85644631564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72217 (or 72215 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 52.

The spelling of 85644631564 in words is "eighty-five billion, six hundred forty-four million, six hundred thirty-one thousand, five hundred sixty-four".