66722368 has 28 divisors (see below), whose sum is σ = 132925312. Its totient is φ = 33229440.

The previous prime is 66722353. The next prime is 66722387. The reversal of 66722368 is 86322766.

It is a self number, because there is not a number n which added to its sum of digits gives 66722368.

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, 15421 + ... + 19267.

Almost surely, 2^66722368 is an apocalyptic number.

It is an amenable number.

66722368 is a deficient number, since it is larger than the sum of its proper divisors (66202944).

66722368 is a wasteful number, since it uses less digits than its factorization.

66722368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130 (or 4120 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 66722368 is about 8168.3760932024. The cubic root of 66722368 is about 405.5930305216.

The spelling of 66722368 in words is "sixty-six million, seven hundred twenty-two thousand, three hundred sixty-eight".