664401236613456 has 80 divisors (see below), whose sum is σ = 1723414577907456. Its totient is φ = 220559366197248.

The previous prime is 664401236613437. The next prime is 664401236613467. The reversal of 664401236613456 is 654316632104466.

It is a junction number, because it is equal to n+sod(n) for n = 664401236613396 and 664401236613405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3475065 + ... + 36618008.

Almost surely, 2^{664401236613456} is an apocalyptic number.

It is an amenable number.

664401236613456 is an abundant number, since it is smaller than the sum of its proper divisors (1059013341294000).

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

664401236613456 is a wasteful number, since it uses less digits than its factorization.

664401236613456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40094500 (or 40094494 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 57.

The spelling of 664401236613456 in words is "six hundred sixty-four trillion, four hundred one billion, two hundred thirty-six million, six hundred thirteen thousand, four hundred fifty-six".