18186875136 has 72 divisors (see below), whose sum is σ = 53781809760. Its totient is φ = 6062289408.

The previous prime is 18186875117. The next prime is 18186875137. The reversal of 18186875136 is 63157868181.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18186875137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1308690 + ... + 1322513.

It is an arithmetic number, because the mean of its divisors is an integer number (746969580).

Almost surely, 2^18186875136 is an apocalyptic number.

18186875136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18186875136 is an abundant number, since it is smaller than the sum of its proper divisors (35594934624).

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

18186875136 is an equidigital number, since it uses as much as digits as its factorization.

18186875136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631228 (or 2631208 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 18186875136 in words is "eighteen billion, one hundred eighty-six million, eight hundred seventy-five thousand, one hundred thirty-six".