64656664 has 16 divisors (see below), whose sum is σ = 121437000. Its totient is φ = 32273472.

The previous prime is 64656653. The next prime is 64656667. The reversal of 64656664 is 46665646.

64656664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 64656664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64656667) 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, 1614 + ... + 11485.

Almost surely, 2^64656664 is an apocalyptic number.

It is an amenable number.

64656664 is a deficient number, since it is larger than the sum of its proper divisors (56780336).

64656664 is a wasteful number, since it uses less digits than its factorization.

64656664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13722 (or 13718 counting only the distinct ones).

The product of its digits is 622080, while the sum is 43.

The square root of 64656664 is about 8040.9367613481. The cubic root of 64656664 is about 401.3633975876.

The spelling of 64656664 in words is "sixty-four million, six hundred fifty-six thousand, six hundred sixty-four".