811398031218 has 64 divisors (see below), whose sum is σ = 1909353824640. Its totient is φ = 254531980800.

The previous prime is 811398031163. The next prime is 811398031219. The reversal of 811398031218 is 812130893118.

811398031218 is a `hidden beast` number, since 8 + 11 + 398 + 0 + 31 + 218 = 666.

It is not an unprimeable number, because it can be changed into a prime (811398031219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11237973 + ... + 11309943.

It is an arithmetic number, because the mean of its divisors is an integer number (29833653510).

Almost surely, 2^811398031218 is an apocalyptic number.

811398031218 is an abundant number, since it is smaller than the sum of its proper divisors (1097955793422).

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

811398031218 is a wasteful number, since it uses less digits than its factorization.

811398031218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84280 (or 84274 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 811398031218 in words is "eight hundred eleven billion, three hundred ninety-eight million, thirty-one thousand, two hundred eighteen".