18869745220624 has 135 divisors (see below), whose sum is σ = 39270455092791. Its totient is φ = 8782387960320.

The previous prime is 18869745220619. The next prime is 18869745220639. The reversal of 18869745220624 is 42602254796881.

The square root of 18869745220624 is 4343932.

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 15832281840400 + 3037463380224 = 3978980^2 + 1742832^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 20138468284 + ... + 20138469220.

Almost surely, 2^{18869745220624} is an apocalyptic number.

18869745220624 is the 4343932-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18869745220624

18869745220624 is an abundant number, since it is smaller than the sum of its proper divisors (20400709872167).

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

18869745220624 is an frugal number, since it uses more digits than its factorization.

18869745220624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 64.

The spelling of 18869745220624 in words is "eighteen trillion, eight hundred sixty-nine billion, seven hundred forty-five million, two hundred twenty thousand, six hundred twenty-four".