66224164 has 6 divisors (see below), whose sum is σ = 115892294. Its totient is φ = 33112080.

The previous prime is 66224141. The next prime is 66224167. The reversal of 66224164 is 46142266.

It can be written as a sum of positive squares in only one way, i.e., 64641600 + 1582564 = 8040^2 + 1258^2 .

It is not an unprimeable number, because it can be changed into a prime (66224167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278017 + ... + 8278024.

Almost surely, 2^66224164 is an apocalyptic number.

It is an amenable number.

66224164 is a deficient number, since it is larger than the sum of its proper divisors (49668130).

66224164 is a wasteful number, since it uses less digits than its factorization.

66224164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16556045 (or 16556043 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 66224164 is about 8137.8230504233. The cubic root of 66224164 is about 404.5810105730.

The spelling of 66224164 in words is "sixty-six million, two hundred twenty-four thousand, one hundred sixty-four".