18539844747264 has 135 divisors (see below), whose sum is σ = 53562693823093. Its totient is φ = 6179397107712.

The previous prime is 18539844747217. The next prime is 18539844747271. The reversal of 18539844747264 is 46274744893581.

It is a happy number.

The square root of 18539844747264 is 4305792.

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

18539844747264 is a `hidden beast` number, since 1 + 8 + 5 + 3 + 9 + 84 + 474 + 72 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 736575897600 + 17803268849664 = 858240^2 + 4219392^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18539844747192 and 18539844747201.

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, 1653418522 + ... + 1653429734.

Almost surely, 2^{18539844747264} is an apocalyptic number.

18539844747264 is the 4305792-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18539844747264

18539844747264 is an abundant number, since it is smaller than the sum of its proper divisors (35022849075829).

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

18539844747264 is an frugal number, since it uses more digits than its factorization.

18539844747264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22460 (or 11218 counting only the distinct ones).

The product of its digits is 1300561920, while the sum is 72.

The spelling of 18539844747264 in words is "eighteen trillion, five hundred thirty-nine billion, eight hundred forty-four million, seven hundred forty-seven thousand, two hundred sixty-four".