664125664 has 24 divisors (see below), whose sum is σ = 1319499720. Its totient is φ = 329014656.

The previous prime is 664125643. The next prime is 664125701. The reversal of 664125664 is 466521466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91714 + ... + 98689.

It is an arithmetic number, because the mean of its divisors is an integer number (54979155).

Almost surely, 2^664125664 is an apocalyptic number.

It is an amenable number.

664125664 is a deficient number, since it is larger than the sum of its proper divisors (655374056).

664125664 is a wasteful number, since it uses less digits than its factorization.

664125664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190522 (or 190514 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 664125664 is about 25770.6356925862. The cubic root of 664125664 is about 872.4691664870.

The spelling of 664125664 in words is "six hundred sixty-four million, one hundred twenty-five thousand, six hundred sixty-four".