6639590979 has 20 divisors (see below), whose sum is σ = 11335316784. Its totient is φ = 3794051664.

The previous prime is 6639590957. The next prime is 6639591017. The reversal of 6639590979 is 9790959366.

6639590979 is a `hidden beast` number, since 6 + 6 + 39 + 590 + 9 + 7 + 9 = 666.

It is not a de Polignac number, because 6639590979 - 2⁷ = 6639590851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (6639590929) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5854452 + ... + 5855585.

Almost surely, 2^6639590979 is an apocalyptic number.

6639590979 is a deficient number, since it is larger than the sum of its proper divisors (4695725805).

6639590979 is a wasteful number, since it uses less digits than its factorization.

6639590979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11710056 (or 11710047 counting only the distinct ones).

The product of its (nonzero) digits is 24800580, while the sum is 63.

The square root of 6639590979 is about 81483.6853547997. The cubic root of 6639590979 is about 1879.5206808641.

The spelling of 6639590979 in words is "six billion, six hundred thirty-nine million, five hundred ninety thousand, nine hundred seventy-nine".