18109923880 has 64 divisors (see below), whose sum is σ = 43193269440. Its totient is φ = 6810104832.

The previous prime is 18109923859. The next prime is 18109923941. The reversal of 18109923880 is 8832990181.

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, 602079 + ... + 631441.

It is an arithmetic number, because the mean of its divisors is an integer number (674894835).

Almost surely, 2^18109923880 is an apocalyptic number.

18109923880 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 18109923880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21596634720).

18109923880 is an abundant number, since it is smaller than the sum of its proper divisors (25083345560).

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

18109923880 is a wasteful number, since it uses less digits than its factorization.

18109923880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30298 (or 30294 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 49.

The spelling of 18109923880 in words is "eighteen billion, one hundred nine million, nine hundred twenty-three thousand, eight hundred eighty".