856194894864 has 75 divisors (see below), whose sum is σ = 2478172843663. Its totient is φ = 285387194592.

The previous prime is 856194894851. The next prime is 856194894871. The reversal of 856194894864 is 468498491658.

The square root of 856194894864 is 925308.

It is a perfect power (a square), and thus also a powerful number.

856194894864 is a `hidden beast` number, since 8 + 5 + 61 + 9 + 4 + 89 + 486 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856194894792 and 856194894801.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 33298237 + ... + 33323939.

Almost surely, 2^856194894864 is an apocalyptic number.

856194894864 is the 925308-th square number.

It is an amenable number.

856194894864 is an abundant number, since it is smaller than the sum of its proper divisors (1621977948799).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856194894864 is an frugal number, since it uses more digits than its factorization.

856194894864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51426 (or 25708 counting only the distinct ones).

The product of its digits is 477757440, while the sum is 72.

The spelling of 856194894864 in words is "eight hundred fifty-six billion, one hundred ninety-four million, eight hundred ninety-four thousand, eight hundred sixty-four".