856303778979 has 16 divisors (see below), whose sum is σ = 1383925299840. Its totient is φ = 518971987080.

The previous prime is 856303778893. The next prime is 856303779077. The reversal of 856303778979 is 979877303658.

856303778979 is a `hidden beast` number, since 85 + 6 + 30 + 377 + 89 + 79 = 666.

It is not a de Polignac number, because 856303778979 - 2⁸ = 856303778723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856303798979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1441588557 + ... + 1441589150.

It is an arithmetic number, because the mean of its divisors is an integer number (86495331240).

Almost surely, 2^856303778979 is an apocalyptic number.

856303778979 is a deficient number, since it is larger than the sum of its proper divisors (527621520861).

856303778979 is a wasteful number, since it uses less digits than its factorization.

856303778979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883177727 (or 2883177721 counting only the distinct ones).

The product of its (nonzero) digits is 480090240, while the sum is 72.

The spelling of 856303778979 in words is "eight hundred fifty-six billion, three hundred three million, seven hundred seventy-eight thousand, nine hundred seventy-nine".