664756612 has 24 divisors (see below), whose sum is σ = 1254793176. Its totient is φ = 306325248.

The previous prime is 664756601. The next prime is 664756621. The reversal of 664756612 is 216657466.

It is a happy number.

664756612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 71639296 + 593117316 = 8464^2 + 24354^2 .

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, 24168 + ... + 43744.

It is an arithmetic number, because the mean of its divisors is an integer number (52283049).

Almost surely, 2^664756612 is an apocalyptic number.

It is an amenable number.

664756612 is a deficient number, since it is larger than the sum of its proper divisors (590036564).

664756612 is a wasteful number, since it uses less digits than its factorization.

664756612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20247 (or 20245 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The square root of 664756612 is about 25782.8743936746. The cubic root of 664756612 is about 872.7453734711.

The spelling of 664756612 in words is "six hundred sixty-four million, seven hundred fifty-six thousand, six hundred twelve".