856633955 has 4 divisors (see below), whose sum is σ = 1027960752. Its totient is φ = 685307160.

The previous prime is 856633913. The next prime is 856633979. The reversal of 856633955 is 559336658.

It is a happy number.

856633955 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 856633955 - 2⁸ = 856633699 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85663391 + ... + 85663400.

It is an arithmetic number, because the mean of its divisors is an integer number (256990188).

Almost surely, 2^856633955 is an apocalyptic number.

856633955 is a deficient number, since it is larger than the sum of its proper divisors (171326797).

856633955 is a wasteful number, since it uses less digits than its factorization.

856633955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171326796.

The product of its digits is 2916000, while the sum is 50.

The square root of 856633955 is about 29268.3097393751. The cubic root of 856633955 is about 949.7262202762.

The spelling of 856633955 in words is "eight hundred fifty-six million, six hundred thirty-three thousand, nine hundred fifty-five".