18391125120 has 64 divisors (see below), whose sum is σ = 58621717440. Its totient is φ = 4904299520.

The previous prime is 18391125097. The next prime is 18391125121. The reversal of 18391125120 is 2152119381.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (18391125121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4787436 + ... + 4791275.

It is an arithmetic number, because the mean of its divisors is an integer number (915964335).

Almost surely, 2^18391125120 is an apocalyptic number.

18391125120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18391125120 is an abundant number, since it is smaller than the sum of its proper divisors (40230592320).

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

18391125120 is an equidigital number, since it uses as much as digits as its factorization.

18391125120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9578733 (or 9578721 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 33.

The spelling of 18391125120 in words is "eighteen billion, three hundred ninety-one million, one hundred twenty-five thousand, one hundred twenty".