66974164 has 18 divisors (see below), whose sum is σ = 123700794. Its totient is φ = 31723920.

The previous prime is 66974153. The next prime is 66974207. The reversal of 66974164 is 46147966.

It can be written as a sum of positive squares in only one way, i.e., 60684100 + 6290064 = 7790^2 + 2508^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66974164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21747 + ... + 24634.

Almost surely, 2^66974164 is an apocalyptic number.

It is an amenable number.

66974164 is a deficient number, since it is larger than the sum of its proper divisors (56726630).

66974164 is a wasteful number, since it uses less digits than its factorization.

66974164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46423 (or 46402 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 66974164 is about 8183.7744348192. The cubic root of 66974164 is about 406.1025972846.

The spelling of 66974164 in words is "sixty-six million, nine hundred seventy-four thousand, one hundred sixty-four".