64631111456 has 24 divisors (see below), whose sum is σ = 127321099164. Its totient is φ = 32295594240.

The previous prime is 64631111431. The next prime is 64631111471. The reversal of 64631111456 is 65411113646.

It can be written as a sum of positive squares in 2 ways, for example, as 63966503056 + 664608400 = 252916^2 + 25780^2 .

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, 571115 + ... + 674858.

Almost surely, 2^64631111456 is an apocalyptic number.

It is an amenable number.

64631111456 is a deficient number, since it is larger than the sum of its proper divisors (62689987708).

64631111456 is a wasteful number, since it uses less digits than its factorization.

64631111456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247604 (or 1247596 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The spelling of 64631111456 in words is "sixty-four billion, six hundred thirty-one million, one hundred eleven thousand, four hundred fifty-six".