39979578179 has 2 divisors, whose sum is σ = 39979578180. Its totient is φ = 39979578178.

The previous prime is 39979578157. The next prime is 39979578187. The reversal of 39979578179 is 97187597993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39979578179 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (39979578109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19989789089 + 19989789090.

It is an arithmetic number, because the mean of its divisors is an integer number (19989789090).

Almost surely, 2^39979578179 is an apocalyptic number.

39979578179 is a deficient number, since it is larger than the sum of its proper divisors (1).

39979578179 is an equidigital number, since it uses as much as digits as its factorization.

39979578179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270050760, while the sum is 74.

The spelling of 39979578179 in words is "thirty-nine billion, nine hundred seventy-nine million, five hundred seventy-eight thousand, one hundred seventy-nine".