66570664 has 16 divisors (see below), whose sum is σ = 126684000. Its totient is φ = 32788272.

The previous prime is 66570649. The next prime is 66570683. The reversal of 66570664 is 46607566.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61564 + ... + 62635.

It is an arithmetic number, because the mean of its divisors is an integer number (7917750).

Almost surely, 2^66570664 is an apocalyptic number.

It is an amenable number.

66570664 is a deficient number, since it is larger than the sum of its proper divisors (60113336).

66570664 is a wasteful number, since it uses less digits than its factorization.

66570664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124272 (or 124268 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 66570664 is about 8159.0847525933. The cubic root of 66570664 is about 405.2854036653.

The spelling of 66570664 in words is "sixty-six million, five hundred seventy thousand, six hundred sixty-four".