18518338503500 has 48 divisors (see below), whose sum is σ = 44120783240352. Its totient is φ = 6733941272000.

The previous prime is 18518338503491. The next prime is 18518338503593. The reversal of 18518338503500 is 530583381581.

It is a Harshad number since it is a multiple of its sum of digits (50).

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, 1683479819 + ... + 1683490818.

It is an arithmetic number, because the mean of its divisors is an integer number (919182984174).

Almost surely, 2^{18518338503500} is an apocalyptic number.

18518338503500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18518338503500 is an abundant number, since it is smaller than the sum of its proper divisors (25602444736852).

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

18518338503500 is a wasteful number, since it uses less digits than its factorization.

18518338503500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366970667 (or 3366970655 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 50.

It can be divided in two parts, 185183 and 38503500, that added together give a palindrome (38688683).

The spelling of 18518338503500 in words is "eighteen trillion, five hundred eighteen billion, three hundred thirty-eight million, five hundred three thousand, five hundred".