856315834836 has 72 divisors (see below), whose sum is σ = 2535584569056. Its totient is φ = 222419695680.

The previous prime is 856315834817. The next prime is 856315834841. The reversal of 856315834836 is 638438513658.

It is a super-2 number, since 2×856315834836² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 856315834836.

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 23 ways as a sum of consecutive naturals, for example, 66189871 + ... + 66202806.

It is an arithmetic number, because the mean of its divisors is an integer number (35216452348).

Almost surely, 2^856315834836 is an apocalyptic number.

It is an amenable number.

856315834836 is an abundant number, since it is smaller than the sum of its proper divisors (1679268734220).

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

856315834836 is a wasteful number, since it uses less digits than its factorization.

856315834836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132392709 (or 132392700 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 60.

The spelling of 856315834836 in words is "eight hundred fifty-six billion, three hundred fifteen million, eight hundred thirty-four thousand, eight hundred thirty-six".