66564680 has 64 divisors (see below), whose sum is σ = 184343040. Its totient is φ = 21065472.

The previous prime is 66564679. The next prime is 66564709. The reversal of 66564680 is 8646566.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5504 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (2880360).

Almost surely, 2^66564680 is an apocalyptic number.

It is an amenable number.

66564680 is an abundant number, since it is smaller than the sum of its proper divisors (117778360).

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

66564680 is a wasteful number, since it uses less digits than its factorization.

66564680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18318 (or 18314 counting only the distinct ones).

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

The square root of 66564680 is about 8158.7180365545. The cubic root of 66564680 is about 405.2732596749.

The spelling of 66564680 in words is "sixty-six million, five hundred sixty-four thousand, six hundred eighty".