651533664 has 48 divisors (see below), whose sum is σ = 1742558832. Its totient is φ = 213078528.

The previous prime is 651533621. The next prime is 651533677. The reversal of 651533664 is 466335156.

It is a happy number.

651533664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×651533664² = 848992230650529792, which 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 7 ways as a sum of consecutive naturals, for example, 58939 + ... + 69114.

It is an arithmetic number, because the mean of its divisors is an integer number (36303309).

Almost surely, 2^651533664 is an apocalyptic number.

It is an amenable number.

651533664 is an abundant number, since it is smaller than the sum of its proper divisors (1091025168).

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

651533664 is a wasteful number, since it uses less digits than its factorization.

651533664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128119 (or 128111 counting only the distinct ones).

The product of its digits is 194400, while the sum is 39.

The square root of 651533664 is about 25525.1574725799. The cubic root of 651533664 is about 866.9198623796.

The spelling of 651533664 in words is "six hundred fifty-one million, five hundred thirty-three thousand, six hundred sixty-four".