856991982854 has 32 divisors (see below), whose sum is σ = 1482715886400. Its totient is φ = 363898009728.

The previous prime is 856991982811. The next prime is 856991982877. The reversal of 856991982854 is 458289199658.

It is a Curzon number.

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, 310724 + ... + 1345560.

It is an arithmetic number, because the mean of its divisors is an integer number (46334871450).

Almost surely, 2^856991982854 is an apocalyptic number.

856991982854 is a deficient number, since it is larger than the sum of its proper divisors (625723903546).

856991982854 is a wasteful number, since it uses less digits than its factorization.

856991982854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035392.

The product of its digits is 447897600, while the sum is 74.

The spelling of 856991982854 in words is "eight hundred fifty-six billion, nine hundred ninety-one million, nine hundred eighty-two thousand, eight hundred fifty-four".