813550384836 has 72 divisors (see below), whose sum is σ = 2351573165760. Its totient is φ = 232312764096.

The previous prime is 813550384781. The next prime is 813550384859. The reversal of 813550384836 is 638483055318.

813550384836 is a `hidden beast` number, since 8 + 1 + 3 + 550 + 3 + 8 + 4 + 83 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 452971 + ... + 1353618.

Almost surely, 2^813550384836 is an apocalyptic number.

It is an amenable number.

813550384836 is an abundant number, since it is smaller than the sum of its proper divisors (1538022780924).

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

813550384836 is a wasteful number, since it uses less digits than its factorization.

813550384836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808393 (or 1808388 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 813550384836 in words is "eight hundred thirteen billion, five hundred fifty million, three hundred eighty-four thousand, eight hundred thirty-six".