856681677686 has 32 divisors (see below), whose sum is σ = 1316673906048. Its totient is φ = 417851929600.

The previous prime is 856681677653. The next prime is 856681677701. The reversal of 856681677686 is 686776186658.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51745586 + ... + 51762138.

It is an arithmetic number, because the mean of its divisors is an integer number (41146059564).

Almost surely, 2^856681677686 is an apocalyptic number.

856681677686 is a deficient number, since it is larger than the sum of its proper divisors (459992228362).

856681677686 is a wasteful number, since it uses less digits than its factorization.

856681677686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18376.

The product of its digits is 975421440, while the sum is 74.

The spelling of 856681677686 in words is "eight hundred fifty-six billion, six hundred eighty-one million, six hundred seventy-seven thousand, six hundred eighty-six".