18200091100 has 72 divisors (see below), whose sum is σ = 40143333440. Its totient is φ = 7161073920.

The previous prime is 18200091071. The next prime is 18200091113. The reversal of 18200091100 is 119000281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2184142 + ... + 2192458.

Almost surely, 2^18200091100 is an apocalyptic number.

18200091100 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 18200091100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20071666720).

18200091100 is an abundant number, since it is smaller than the sum of its proper divisors (21943242340).

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

18200091100 is a wasteful number, since it uses less digits than its factorization.

18200091100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8687 (or 8680 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 18200091100 its reverse (119000281), we get a palindrome (18319091381).

The spelling of 18200091100 in words is "eighteen billion, two hundred million, ninety-one thousand, one hundred".