856685870894 has 128 divisors (see below), whose sum is σ = 1580833013760. Its totient is φ = 340318319616.

The previous prime is 856685870839. The next prime is 856685870903. The reversal of 856685870894 is 498078586658.

It is a super-2 number, since 2×856685870894² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 374588219 + ... + 374590505.

It is an arithmetic number, because the mean of its divisors is an integer number (12350257920).

Almost surely, 2^856685870894 is an apocalyptic number.

856685870894 is a deficient number, since it is larger than the sum of its proper divisors (724147142866).

856685870894 is a wasteful number, since it uses less digits than its factorization.

856685870894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662.

The product of its (nonzero) digits is 928972800, while the sum is 74.

The spelling of 856685870894 in words is "eight hundred fifty-six billion, six hundred eighty-five million, eight hundred seventy thousand, eight hundred ninety-four".