18938929164544 has 81 divisors (see below), whose sum is σ = 38196063319519. Its totient is φ = 9372225996800.

The previous prime is 18938929164527. The next prime is 18938929164553. The reversal of 18938929164544 is 44546192983981.

The square root of 18938929164544 is 4351888.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4287550009600 + 14651379154944 = 2070640^2 + 3827712^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7032649662 + ... + 7032652354.

Almost surely, 2^{18938929164544} is an apocalyptic number.

18938929164544 is the 4351888-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18938929164544

18938929164544 is an abundant number, since it is smaller than the sum of its proper divisors (19257134154975).

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

18938929164544 is an frugal number, since it uses more digits than its factorization.

18938929164544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5604 (or 2796 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 73.

The spelling of 18938929164544 in words is "eighteen trillion, nine hundred thirty-eight billion, nine hundred twenty-nine million, one hundred sixty-four thousand, five hundred forty-four".