66568976 has 10 divisors (see below), whose sum is σ = 128977422. Its totient is φ = 33284480.

The previous prime is 66568963. The next prime is 66568979. The reversal of 66568976 is 67986566.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 17007376 = 7040^2 + 4124^2 .

It is not an unprimeable number, because it can be changed into a prime (66568979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2080265 + ... + 2080296.

Almost surely, 2^66568976 is an apocalyptic number.

It is an amenable number.

66568976 is a deficient number, since it is larger than the sum of its proper divisors (62408446).

66568976 is a wasteful number, since it uses less digits than its factorization.

66568976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160569 (or 4160563 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 53.

The square root of 66568976 is about 8158.9813089625. The cubic root of 66568976 is about 405.2819780947.

The spelling of 66568976 in words is "sixty-six million, five hundred sixty-eight thousand, nine hundred seventy-six".