651664562256 has 80 divisors (see below), whose sum is σ = 1916141109120. Its totient is φ = 211923429120.

The previous prime is 651664562209. The next prime is 651664562273. The reversal of 651664562256 is 652265466156.

It is a happy number.

651664562256 is a `hidden beast` number, since 6 + 5 + 1 + 6 + 6 + 4 + 5 + 622 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 18378420 + ... + 18413843.

It is an arithmetic number, because the mean of its divisors is an integer number (23951763864).

Almost surely, 2^651664562256 is an apocalyptic number.

It is an amenable number.

651664562256 is an abundant number, since it is smaller than the sum of its proper divisors (1264476546864).

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

651664562256 is a wasteful number, since it uses less digits than its factorization.

651664562256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36792321 (or 36792309 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 54.

The spelling of 651664562256 in words is "six hundred fifty-one billion, six hundred sixty-four million, five hundred sixty-two thousand, two hundred fifty-six".