66572979 has 32 divisors (see below), whose sum is σ = 103161600. Its totient is φ = 37762560.

The previous prime is 66572963. The next prime is 66572999. The reversal of 66572979 is 97927566.

It is not a de Polignac number, because 66572979 - 2⁴ = 66572963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66572959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55207 + ... + 56399.

It is an arithmetic number, because the mean of its divisors is an integer number (3223800).

Almost surely, 2^66572979 is an apocalyptic number.

66572979 is a deficient number, since it is larger than the sum of its proper divisors (36588621).

66572979 is a wasteful number, since it uses less digits than its factorization.

66572979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315.

The product of its digits is 1428840, while the sum is 51.

The square root of 66572979 is about 8159.2266177622. The cubic root of 66572979 is about 405.2901015547.

The spelling of 66572979 in words is "sixty-six million, five hundred seventy-two thousand, nine hundred seventy-nine".