18131318184 has 128 divisors (see below), whose sum is σ = 52238131200. Its totient is φ = 5137144320.

The previous prime is 18131318167. The next prime is 18131318189. The reversal of 18131318184 is 48181313181.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18131318189) 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, 11281909 + ... + 11283515.

It is an arithmetic number, because the mean of its divisors is an integer number (408110400).

Almost surely, 2^18131318184 is an apocalyptic number.

18131318184 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18131318184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26119065600).

18131318184 is an abundant number, since it is smaller than the sum of its proper divisors (34106813016).

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

18131318184 is a wasteful number, since it uses less digits than its factorization.

18131318184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143 (or 2139 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The spelling of 18131318184 in words is "eighteen billion, one hundred thirty-one million, three hundred eighteen thousand, one hundred eighty-four".