813680856636 has 48 divisors (see below), whose sum is σ = 1998649699200. Its totient is φ = 256934452032.

The previous prime is 813680856613. The next prime is 813680856643. The reversal of 813680856636 is 636658086318.

It is a super-3 number, since 3×813680856636³ (a number of 37 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 813680856636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3490170 + ... + 3715998.

It is an arithmetic number, because the mean of its divisors is an integer number (41638535400).

Almost surely, 2^813680856636 is an apocalyptic number.

It is an amenable number.

813680856636 is an abundant number, since it is smaller than the sum of its proper divisors (1184968842564).

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

813680856636 is a wasteful number, since it uses less digits than its factorization.

813680856636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241658 (or 241656 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 60.

The spelling of 813680856636 in words is "eight hundred thirteen billion, six hundred eighty million, eight hundred fifty-six thousand, six hundred thirty-six".