18113979520 has 512 divisors, whose sum is σ = 56151244800. Its totient is φ = 5434490880.

The previous prime is 18113979503. The next prime is 18113979589. The reversal of 18113979520 is 2597931181.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 142629697 + ... + 142629823.

It is an arithmetic number, because the mean of its divisors is an integer number (109670400).

Almost surely, 2^18113979520 is an apocalyptic number.

18113979520 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 18113979520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28075622400).

18113979520 is an abundant number, since it is smaller than the sum of its proper divisors (38037265280).

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

18113979520 is a wasteful number, since it uses less digits than its factorization.

18113979520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 46.

The spelling of 18113979520 in words is "eighteen billion, one hundred thirteen million, nine hundred seventy-nine thousand, five hundred twenty".