18539717988012 has 96 divisors (see below), whose sum is σ = 49060390579200. Its totient is φ = 5401925240832.

The previous prime is 18539717987929. The next prime is 18539717988079. The reversal of 18539717988012 is 21088971793581.

It is a super-2 number, since 2×18539717988012² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5411164 + ... + 8146172.

It is an arithmetic number, because the mean of its divisors is an integer number (511045735200).

Almost surely, 2^{18539717988012} is an apocalyptic number.

18539717988012 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 18539717988012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24530195289600).

18539717988012 is an abundant number, since it is smaller than the sum of its proper divisors (30520672591188).

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

18539717988012 is a wasteful number, since it uses less digits than its factorization.

18539717988012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737335 (or 2737333 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 69.

The spelling of 18539717988012 in words is "eighteen trillion, five hundred thirty-nine billion, seven hundred seventeen million, nine hundred eighty-eight thousand, twelve".