856380664884 has 48 divisors (see below), whose sum is σ = 2024103566016. Its totient is φ = 281779872000.

The previous prime is 856380664879. The next prime is 856380664891. The reversal of 856380664884 is 488466083658.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666177 + ... + 1468520.

It is an arithmetic number, because the mean of its divisors is an integer number (42168824292).

Almost surely, 2^856380664884 is an apocalyptic number.

It is an amenable number.

856380664884 is an abundant number, since it is smaller than the sum of its proper divisors (1167722901132).

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

856380664884 is a wasteful number, since it uses less digits than its factorization.

856380664884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135136 (or 2135134 counting only the distinct ones).

The product of its (nonzero) digits is 212336640, while the sum is 66.

The spelling of 856380664884 in words is "eight hundred fifty-six billion, three hundred eighty million, six hundred sixty-four thousand, eight hundred eighty-four".