856825566 has 16 divisors (see below), whose sum is σ = 1727145984. Its totient is φ = 283359384.

The previous prime is 856825559. The next prime is 856825591. The reversal of 856825566 is 665528658.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561460 + ... + 562983.

It is an arithmetic number, because the mean of its divisors is an integer number (107946624).

Almost surely, 2^856825566 is an apocalyptic number.

856825566 is an abundant number, since it is smaller than the sum of its proper divisors (870320418).

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

856825566 is a wasteful number, since it uses less digits than its factorization.

856825566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124575.

The product of its digits is 3456000, while the sum is 51.

The square root of 856825566 is about 29271.5829090263. The cubic root of 856825566 is about 949.7970262578.

The spelling of 856825566 in words is "eight hundred fifty-six million, eight hundred twenty-five thousand, five hundred sixty-six".