18539185717572 has 48 divisors (see below), whose sum is σ = 46591826766912. Its totient is φ = 5703608027520.

The previous prime is 18539185717541. The next prime is 18539185717609. The reversal of 18539185717572 is 27571758193581.

It is a junction number, because it is equal to n+sod(n) for n = 18539185717497 and 18539185717506.

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 15 ways as a sum of consecutive naturals, for example, 6703258 + ... + 9056049.

It is an arithmetic number, because the mean of its divisors is an integer number (970663057644).

Almost surely, 2^{18539185717572} is an apocalyptic number.

18539185717572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18539185717572 is an abundant number, since it is smaller than the sum of its proper divisors (28052641049340).

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

18539185717572 is a wasteful number, since it uses less digits than its factorization.

18539185717572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15766868 (or 15766866 counting only the distinct ones).

The product of its digits is 148176000, while the sum is 69.

The spelling of 18539185717572 in words is "eighteen trillion, five hundred thirty-nine billion, one hundred eighty-five million, seven hundred seventeen thousand, five hundred seventy-two".