664451504 has 10 divisors (see below), whose sum is σ = 1287374820. Its totient is φ = 332225744.

The previous prime is 664451497. The next prime is 664451521. The reversal of 664451504 is 405154466.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20764094 + ... + 20764125.

It is an arithmetic number, because the mean of its divisors is an integer number (128737482).

Almost surely, 2^664451504 is an apocalyptic number.

It is an amenable number.

664451504 is a deficient number, since it is larger than the sum of its proper divisors (622923316).

664451504 is a wasteful number, since it uses less digits than its factorization.

664451504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41528227 (or 41528221 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 664451504 is about 25776.9568413341. The cubic root of 664451504 is about 872.6118296848.

The spelling of 664451504 in words is "six hundred sixty-four million, four hundred fifty-one thousand, five hundred four".