66710979 has 8 divisors (see below), whose sum is σ = 98831120. Its totient is φ = 44473968.

The previous prime is 66710947. The next prime is 66710983. The reversal of 66710979 is 97901766.

It is not a de Polignac number, because 66710979 - 2⁵ = 66710947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66710939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1235362 + ... + 1235415.

It is an arithmetic number, because the mean of its divisors is an integer number (12353890).

Almost surely, 2^66710979 is an apocalyptic number.

66710979 is a deficient number, since it is larger than the sum of its proper divisors (32120141).

66710979 is a wasteful number, since it uses less digits than its factorization.

66710979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470786 (or 2470780 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 66710979 is about 8167.6789236600. The cubic root of 66710979 is about 405.5699519948.

The spelling of 66710979 in words is "sixty-six million, seven hundred ten thousand, nine hundred seventy-nine".