18109657500 has 480 divisors, whose sum is σ = 60897306624. Its totient is φ = 4147200000.

The previous prime is 18109657493. The next prime is 18109657513. The reversal of 18109657500 is 575690181.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 186697452 + ... + 186697548.

Almost surely, 2^18109657500 is an apocalyptic number.

18109657500 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 18109657500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30448653312).

18109657500 is an abundant number, since it is smaller than the sum of its proper divisors (42787649124).

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

18109657500 is a wasteful number, since it uses less digits than its factorization.

18109657500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 42.

The spelling of 18109657500 in words is "eighteen billion, one hundred nine million, six hundred fifty-seven thousand, five hundred".