66568816 has 20 divisors (see below), whose sum is σ = 131977912. Its totient is φ = 32510016.

The previous prime is 66568813. The next prime is 66568841. The reversal of 66568816 is 61886566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66568813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47691 + ... + 49066.

Almost surely, 2^66568816 is an apocalyptic number.

It is an amenable number.

66568816 is a deficient number, since it is larger than the sum of its proper divisors (65409096).

66568816 is a wasteful number, since it uses less digits than its factorization.

66568816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96808 (or 96802 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 66568816 is about 8158.9715038110. The cubic root of 66568816 is about 405.2816533930.

The spelling of 66568816 in words is "sixty-six million, five hundred sixty-eight thousand, eight hundred sixteen".