18187718112 has 36 divisors (see below), whose sum is σ = 51721324200. Its totient is φ = 6062572608.

The previous prime is 18187718111. The next prime is 18187718149. The reversal of 18187718112 is 21181778181.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18187718111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31575612 + ... + 31576187.

It is an arithmetic number, because the mean of its divisors is an integer number (1436703450).

Almost surely, 2^18187718112 is an apocalyptic number.

18187718112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18187718112 is an abundant number, since it is smaller than the sum of its proper divisors (33533606088).

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

18187718112 is a wasteful number, since it uses less digits than its factorization.

18187718112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63151815 (or 63151804 counting only the distinct ones).

The product of its digits is 50176, while the sum is 45.

The spelling of 18187718112 in words is "eighteen billion, one hundred eighty-seven million, seven hundred eighteen thousand, one hundred twelve".