18831117312 has 132 divisors (see below), whose sum is σ = 62142432976. Its totient is φ = 5380300800.

The previous prime is 18831117299. The next prime is 18831117343. The reversal of 18831117312 is 21371113881.

18831117312 is a `hidden beast` number, since 18 + 8 + 311 + 17 + 312 = 666.

It is a super-2 number, since 2×18831117312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81439 + ... + 210462.

Almost surely, 2^18831117312 is an apocalyptic number.

18831117312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18831117312 is an abundant number, since it is smaller than the sum of its proper divisors (43311315664).

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

18831117312 is a wasteful number, since it uses less digits than its factorization.

18831117312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291934 (or 291913 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The spelling of 18831117312 in words is "eighteen billion, eight hundred thirty-one million, one hundred seventeen thousand, three hundred twelve".