64640604056 has 48 divisors (see below), whose sum is σ = 143128080720. Its totient is φ = 26809444800.

The previous prime is 64640604043. The next prime is 64640604103. The reversal of 64640604056 is 65040604646.

64640604056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64640604056² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 546755 + ... + 654386.

It is an arithmetic number, because the mean of its divisors is an integer number (2981835015).

Almost surely, 2^64640604056 is an apocalyptic number.

It is an amenable number.

64640604056 is an abundant number, since it is smaller than the sum of its proper divisors (78487476664).

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

64640604056 is a wasteful number, since it uses less digits than its factorization.

64640604056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201216 (or 1201181 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 64640604056 in words is "sixty-four billion, six hundred forty million, six hundred four thousand, fifty-six".