18131500000 has 84 divisors (see below), whose sum is σ = 44621147592. Its totient is φ = 7252400000.

The previous prime is 18131499983. The next prime is 18131500021. The reversal of 18131500000 is 513181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 481869 + ... + 518131.

It is an arithmetic number, because the mean of its divisors is an integer number (531204138).

Almost surely, 2^18131500000 is an apocalyptic number.

18131500000 is a gapful number since it is divisible by the number (10) 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 18131500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22310573796).

18131500000 is an abundant number, since it is smaller than the sum of its proper divisors (26489647592).

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

18131500000 is an frugal number, since it uses more digits than its factorization.

18131500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36303 (or 36270 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The spelling of 18131500000 in words is "eighteen billion, one hundred thirty-one million, five hundred thousand".