66979874 has 16 divisors (see below), whose sum is σ = 108592512. Its totient is φ = 30801168.

The previous prime is 66979873. The next prime is 66979877. The reversal of 66979874 is 47897966.

It is not an unprimeable number, because it can be changed into a prime (66979873) 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, 2807 + ... + 11909.

It is an arithmetic number, because the mean of its divisors is an integer number (6787032).

Almost surely, 2^66979874 is an apocalyptic number.

66979874 is a deficient number, since it is larger than the sum of its proper divisors (41612638).

66979874 is a wasteful number, since it uses less digits than its factorization.

66979874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9401.

The product of its digits is 4572288, while the sum is 56.

The square root of 66979874 is about 8184.1232884164. The cubic root of 66979874 is about 406.1141379534.

The spelling of 66979874 in words is "sixty-six million, nine hundred seventy-nine thousand, eight hundred seventy-four".