66944664 has 32 divisors (see below), whose sum is σ = 185958000. Its totient is φ = 22314816.

The previous prime is 66944653. The next prime is 66944681. The reversal of 66944664 is 46644966.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154749 + ... + 155180.

Almost surely, 2^66944664 is an apocalyptic number.

It is an amenable number.

66944664 is an abundant number, since it is smaller than the sum of its proper divisors (119013336).

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

66944664 is a wasteful number, since it uses less digits than its factorization.

66944664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309944 (or 309934 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 66944664 is about 8181.9718894653. The cubic root of 66944664 is about 406.0429634135.

The spelling of 66944664 in words is "sixty-six million, nine hundred forty-four thousand, six hundred sixty-four".