651320664 has 64 divisors (see below), whose sum is σ = 1686051840. Its totient is φ = 209450880.

The previous prime is 651320611. The next prime is 651320737. The reversal of 651320664 is 466023156.

651320664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 276339 + ... + 278685.

It is an arithmetic number, because the mean of its divisors is an integer number (26344560).

Almost surely, 2^651320664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651320664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843025920).

651320664 is an abundant number, since it is smaller than the sum of its proper divisors (1034731176).

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

651320664 is a wasteful number, since it uses less digits than its factorization.

651320664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760 (or 2756 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 651320664 is about 25520.9847772377. The cubic root of 651320664 is about 866.8253806631.

The spelling of 651320664 in words is "six hundred fifty-one million, three hundred twenty thousand, six hundred sixty-four".