64520607320856 has 96 divisors (see below), whose sum is σ = 181189073694720. Its totient is φ = 20719766692800.

The previous prime is 64520607320831. The next prime is 64520607320867. The reversal of 64520607320856 is 65802370602546.

64520607320856 is a `hidden beast` number, since 6 + 4 + 5 + 2 + 0 + 607 + 3 + 20 + 8 + 5 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64316350 + ... + 65311821.

It is an arithmetic number, because the mean of its divisors is an integer number (1887386184320).

Almost surely, 2^{64520607320856} is an apocalyptic number.

It is an amenable number.

64520607320856 is an abundant number, since it is smaller than the sum of its proper divisors (116668466373864).

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

64520607320856 is a wasteful number, since it uses less digits than its factorization.

64520607320856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129628437 (or 129628430 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 54.

The spelling of 64520607320856 in words is "sixty-four trillion, five hundred twenty billion, six hundred seven million, three hundred twenty thousand, eight hundred fifty-six".