18320565744009 has 9 divisors (see below), whose sum is σ = 26463057955789. Its totient is φ = 12213701935500.

The previous prime is 18320565743999. The next prime is 18320565744049. The reversal of 18320565744009 is 90044756502381.

It is a happy number.

The square root of 18320565744009 is 4280253.

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

18320565744009 is a `hidden beast` number, since 1 + 8 + 3 + 2 + 0 + 565 + 74 + 4 + 0 + 0 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-18320565744009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18320565744049) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12127384 + ... + 13554134.

It is a 1-persistent number, because it is pandigital, but 2⋅18320565744009 = 36641131488018 is not.

Almost surely, 2^{18320565744009} is an apocalyptic number.

18320565744009 is the 4280253-rd square number.

18320565744009 is the 2140127-th centered octagonal number.

It is an amenable number.

18320565744009 is a deficient number, since it is larger than the sum of its proper divisors (8142492211780).

18320565744009 is an frugal number, since it uses more digits than its factorization.

18320565744009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853508 (or 1426754 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 18320565744009 in words is "eighteen trillion, three hundred twenty billion, five hundred sixty-five million, seven hundred forty-four thousand, nine".