18173239128 has 96 divisors (see below), whose sum is σ = 53819251200. Its totient is φ = 5494161600.

The previous prime is 18173239099. The next prime is 18173239181. The reversal of 18173239128 is 82193237181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 314733 + ... + 367971.

It is an arithmetic number, because the mean of its divisors is an integer number (560617200).

Almost surely, 2^18173239128 is an apocalyptic number.

18173239128 is a gapful number since it is divisible by the number (18) 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 18173239128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26909625600).

18173239128 is an abundant number, since it is smaller than the sum of its proper divisors (35646012072).

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

18173239128 is a wasteful number, since it uses less digits than its factorization.

18173239128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53693 (or 53686 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The spelling of 18173239128 in words is "eighteen billion, one hundred seventy-three million, two hundred thirty-nine thousand, one hundred twenty-eight".