85639692179 has 2 divisors, whose sum is σ = 85639692180. Its totient is φ = 85639692178.

The previous prime is 85639692071. The next prime is 85639692181. The reversal of 85639692179 is 97129693658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85639692179 - 2²⁸ = 85371256723 is a prime.

Together with 85639692181, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85639692979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42819846089 + 42819846090.

It is an arithmetic number, because the mean of its divisors is an integer number (42819846090).

Almost surely, 2^85639692179 is an apocalyptic number.

85639692179 is a deficient number, since it is larger than the sum of its proper divisors (1).

85639692179 is an equidigital number, since it uses as much as digits as its factorization.

85639692179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44089920, while the sum is 65.

The spelling of 85639692179 in words is "eighty-five billion, six hundred thirty-nine million, six hundred ninety-two thousand, one hundred seventy-nine".