64697639408 has 40 divisors (see below), whose sum is σ = 125895181776. Its totient is φ = 32208768000.

The previous prime is 64697639401. The next prime is 64697639443. The reversal of 64697639408 is 80493679646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64697639401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5624543 + ... + 5636033.

Almost surely, 2^64697639408 is an apocalyptic number.

It is an amenable number.

64697639408 is a deficient number, since it is larger than the sum of its proper divisors (61197542368).

64697639408 is a wasteful number, since it uses less digits than its factorization.

64697639408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12993 (or 12987 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 62.

The spelling of 64697639408 in words is "sixty-four billion, six hundred ninety-seven million, six hundred thirty-nine thousand, four hundred eight".