651265664 has 48 divisors (see below), whose sum is σ = 1509285330. Its totient is φ = 279111168.

The previous prime is 651265633. The next prime is 651265711. The reversal of 651265664 is 466562156.

It can be written as a sum of positive squares in only one way, i.e., 519475264 + 131790400 = 22792^2 + 11480^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45647 + ... + 58190.

Almost surely, 2^651265664 is an apocalyptic number.

651265664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

651265664 is an abundant number, since it is smaller than the sum of its proper divisors (858019666).

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

651265664 is a wasteful number, since it uses less digits than its factorization.

651265664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103865 (or 103846 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The square root of 651265664 is about 25519.9072098627. The cubic root of 651265664 is about 866.8009806297.

The spelling of 651265664 in words is "six hundred fifty-one million, two hundred sixty-five thousand, six hundred sixty-four".