18109912320 has 864 divisors, whose sum is σ = 72547937280. Its totient is φ = 4140564480.

The previous prime is 18109912291. The next prime is 18109912451. The reversal of 18109912320 is 2321990181.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 115349682 + ... + 115349838.

It is an arithmetic number, because the mean of its divisors is an integer number (83967520).

Almost surely, 2^18109912320 is an apocalyptic number.

18109912320 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 18109912320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36273968640).

18109912320 is an abundant number, since it is smaller than the sum of its proper divisors (54438024960).

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

18109912320 is a wasteful number, since it uses less digits than its factorization.

18109912320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The spelling of 18109912320 in words is "eighteen billion, one hundred nine million, nine hundred twelve thousand, three hundred twenty".