66508664 has 16 divisors (see below), whose sum is σ = 131267400. Its totient is φ = 31504032.

The previous prime is 66508643. The next prime is 66508669. The reversal of 66508664 is 46680566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66508669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218627 + ... + 218930.

Almost surely, 2^66508664 is an apocalyptic number.

It is an amenable number.

66508664 is a deficient number, since it is larger than the sum of its proper divisors (64758736).

66508664 is a wasteful number, since it uses less digits than its factorization.

66508664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437582 (or 437578 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 66508664 is about 8155.2844217722. The cubic root of 66508664 is about 405.1595449243.

The spelling of 66508664 in words is "sixty-six million, five hundred eight thousand, six hundred sixty-four".