18503501836872 has 128 divisors (see below), whose sum is σ = 52039056787200. Its totient is φ = 5439982682112.

The previous prime is 18503501836867. The next prime is 18503501836873. The reversal of 18503501836872 is 27863810530581.

It is not an unprimeable number, because it can be changed into a prime (18503501836873) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5278708 + ... + 8054300.

It is an arithmetic number, because the mean of its divisors is an integer number (406555131150).

Almost surely, 2^{18503501836872} is an apocalyptic number.

18503501836872 is a gapful number since it is divisible by the number (12) 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 18503501836872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26019528393600).

18503501836872 is an abundant number, since it is smaller than the sum of its proper divisors (33535554950328).

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

18503501836872 is a wasteful number, since it uses less digits than its factorization.

18503501836872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776567 (or 2776563 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 18503501836872 in words is "eighteen trillion, five hundred three billion, five hundred one million, eight hundred thirty-six thousand, eight hundred seventy-two".