18189157180 has 48 divisors (see below), whose sum is σ = 39164567904. Its totient is φ = 7091732480.

The previous prime is 18189157171. The next prime is 18189157187. The reversal of 18189157180 is 8175198181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18189157187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944124 + ... + 963196.

It is an arithmetic number, because the mean of its divisors is an integer number (815928498).

Almost surely, 2^18189157180 is an apocalyptic number.

18189157180 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 18189157180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19582283952).

18189157180 is an abundant number, since it is smaller than the sum of its proper divisors (20975410724).

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

18189157180 is a wasteful number, since it uses less digits than its factorization.

18189157180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20286 (or 20284 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 49.

The spelling of 18189157180 in words is "eighteen billion, one hundred eighty-nine million, one hundred fifty-seven thousand, one hundred eighty".