856091005984 has 12 divisors (see below), whose sum is σ = 1685429168094. Its totient is φ = 428045502976.

The previous prime is 856091005981. The next prime is 856091005997. The reversal of 856091005984 is 489500190658.

It can be written as a sum of positive squares in only one way, i.e., 746945347600 + 109145658384 = 864260^2 + 330372^2 .

It is not an unprimeable number, because it can be changed into a prime (856091005981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13376421937 + ... + 13376422000.

Almost surely, 2^856091005984 is an apocalyptic number.

It is an amenable number.

856091005984 is a deficient number, since it is larger than the sum of its proper divisors (829338162110).

856091005984 is a wasteful number, since it uses less digits than its factorization.

856091005984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26752843947 (or 26752843939 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 55.

The spelling of 856091005984 in words is "eight hundred fifty-six billion, ninety-one million, five thousand, nine hundred eighty-four".