856496685566 has 8 divisors (see below), whose sum is σ = 1308985500744. Its totient is φ = 420168185320.

The previous prime is 856496685493. The next prime is 856496685581. The reversal of 856496685566 is 665586694658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 856496685493 and 856496685502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4040078600 + ... + 4040078811.

It is an arithmetic number, because the mean of its divisors is an integer number (163623187593).

Almost surely, 2^856496685566 is an apocalyptic number.

856496685566 is a deficient number, since it is larger than the sum of its proper divisors (452488815178).

856496685566 is a wasteful number, since it uses less digits than its factorization.

856496685566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8080157466.

The product of its digits is 2239488000, while the sum is 74.

The spelling of 856496685566 in words is "eight hundred fifty-six billion, four hundred ninety-six million, six hundred eighty-five thousand, five hundred sixty-six".