18387188500 has 48 divisors (see below), whose sum is σ = 40208877072. Its totient is φ = 7345488000.

The previous prime is 18387188461. The next prime is 18387188513. The reversal of 18387188500 is 588178381.

It can be written as a sum of positive squares in 8 ways, for example, as 10749127684 + 7638060816 = 103678^2 + 87396^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375430 + ... + 421570.

It is an arithmetic number, because the mean of its divisors is an integer number (837684939).

Almost surely, 2^18387188500 is an apocalyptic number.

18387188500 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 18387188500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20104438536).

18387188500 is an abundant number, since it is smaller than the sum of its proper divisors (21821688572).

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

18387188500 is a wasteful number, since it uses less digits than its factorization.

18387188500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46957 (or 46945 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 49.

The spelling of 18387188500 in words is "eighteen billion, three hundred eighty-seven million, one hundred eighty-eight thousand, five hundred".