66980768 has 12 divisors (see below), whose sum is σ = 131868450. Its totient is φ = 33490368.

The previous prime is 66980759. The next prime is 66980773. The reversal of 66980768 is 86708966.

It can be written as a sum of positive squares in only one way, i.e., 61653904 + 5326864 = 7852^2 + 2308^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1046543 + ... + 1046606.

Almost surely, 2^66980768 is an apocalyptic number.

It is an amenable number.

66980768 is a deficient number, since it is larger than the sum of its proper divisors (64887682).

66980768 is a wasteful number, since it uses less digits than its factorization.

66980768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093159 (or 2093151 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 66980768 is about 8184.1779061797. The cubic root of 66980768 is about 406.1159447868.

The spelling of 66980768 in words is "sixty-six million, nine hundred eighty thousand, seven hundred sixty-eight".