66880868 has 6 divisors (see below), whose sum is σ = 117041526. Its totient is φ = 33440432.

The previous prime is 66880843. The next prime is 66880889. The reversal of 66880868 is 86808866.

It can be written as a sum of positive squares in only one way, i.e., 38663524 + 28217344 = 6218^2 + 5312^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360105 + ... + 8360112.

It is an arithmetic number, because the mean of its divisors is an integer number (19506921).

Almost surely, 2^66880868 is an apocalyptic number.

It is an amenable number.

66880868 is a deficient number, since it is larger than the sum of its proper divisors (50160658).

66880868 is a wasteful number, since it uses less digits than its factorization.

66880868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16720221 (or 16720219 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 50.

The square root of 66880868 is about 8178.0723890169. The cubic root of 66880868 is about 405.9139406842.

The spelling of 66880868 in words is "sixty-six million, eight hundred eighty thousand, eight hundred sixty-eight".