856807808786 has 8 divisors (see below), whose sum is σ = 1285216063164. Its totient is φ = 428402454400.

The previous prime is 856807808771. The next prime is 856807808819. The reversal of 856807808786 is 687808708658.

It can be written as a sum of positive squares in 2 ways, for example, as 581779935025 + 275027873761 = 762745^2 + 524431^2 .

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

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, 308006 + ... + 1344798.

Almost surely, 2^856807808786 is an apocalyptic number.

856807808786 is a deficient number, since it is larger than the sum of its proper divisors (428408254378).

856807808786 is a wasteful number, since it uses less digits than its factorization.

856807808786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449996.

The product of its (nonzero) digits is 289013760, while the sum is 71.

The spelling of 856807808786 in words is "eight hundred fifty-six billion, eight hundred seven million, eight hundred eight thousand, seven hundred eighty-six".