856856852179 has 2 divisors, whose sum is σ = 856856852180. Its totient is φ = 856856852178.

The previous prime is 856856852171. The next prime is 856856852183. The reversal of 856856852179 is 971258658658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856856852179 - 2³ = 856856852171 is a prime.

It is a super-2 number, since 2×856856852179² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856856852171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428428426089 + 428428426090.

It is an arithmetic number, because the mean of its divisors is an integer number (428428426090).

Almost surely, 2^856856852179 is an apocalyptic number.

856856852179 is a deficient number, since it is larger than the sum of its proper divisors (1).

856856852179 is an equidigital number, since it uses as much as digits as its factorization.

856856852179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304000, while the sum is 70.

The spelling of 856856852179 in words is "eight hundred fifty-six billion, eight hundred fifty-six million, eight hundred fifty-two thousand, one hundred seventy-nine".