66321056 has 24 divisors (see below), whose sum is σ = 131732244. Its totient is φ = 32865280.

The previous prime is 66321049. The next prime is 66321071. The reversal of 66321056 is 65012366.

It can be written as a sum of positive squares in 2 ways, for example, as 47831056 + 18490000 = 6916^2 + 4300^2 .

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, 5555 + ... + 12786.

Almost surely, 2^66321056 is an apocalyptic number.

It is an amenable number.

66321056 is a deficient number, since it is larger than the sum of its proper divisors (65411188).

66321056 is a wasteful number, since it uses less digits than its factorization.

66321056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18464 (or 18456 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66321056 is about 8143.7740636636. The cubic root of 66321056 is about 404.7782274114.

The spelling of 66321056 in words is "sixty-six million, three hundred twenty-one thousand, fifty-six".