18513330554944 has 63 divisors (see below), whose sum is σ = 36926813126541. Its totient is φ = 9209180547840.

The previous prime is 18513330554933. The next prime is 18513330554951. The reversal of 18513330554944 is 44945503331581.

The square root of 18513330554944 is 4302712.

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

It can be written as a sum of positive squares in only one way, i.e., 17117151994944 + 1396178560000 = 4137288^2 + 1181600^2 .

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, 7262976582 + ... + 7262979130.

Almost surely, 2^{18513330554944} is an apocalyptic number.

18513330554944 is the 4302712-nd square number.

It is an amenable number.

18513330554944 is a deficient number, since it is larger than the sum of its proper divisors (18413482571597).

18513330554944 is an frugal number, since it uses more digits than its factorization.

18513330554944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532 (or 2762 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 55.

The spelling of 18513330554944 in words is "eighteen trillion, five hundred thirteen billion, three hundred thirty million, five hundred fifty-four thousand, nine hundred forty-four".