664634656 has 24 divisors (see below), whose sum is σ = 1495428480. Its totient is φ = 284843328.

The previous prime is 664634651. The next prime is 664634671. The reversal of 664634656 is 656436466.

It is not an unprimeable number, because it can be changed into a prime (664634651) by changing a digit.

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, 1483336 + ... + 1483783.

It is an arithmetic number, because the mean of its divisors is an integer number (62309520).

Almost surely, 2^664634656 is an apocalyptic number.

It is an amenable number.

664634656 is an abundant number, since it is smaller than the sum of its proper divisors (830793824).

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

664634656 is a wasteful number, since it uses less digits than its factorization.

664634656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967136 (or 2967128 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 46.

The square root of 664634656 is about 25780.5092269334. The cubic root of 664634656 is about 872.6919990268.

The spelling of 664634656 in words is "six hundred sixty-four million, six hundred thirty-four thousand, six hundred fifty-six".