18320411655225 has 81 divisors (see below), whose sum is σ = 33290853149359. Its totient is φ = 9630871168800.

The previous prime is 18320411655211. The next prime is 18320411655251. The reversal of 18320411655225 is 52255611402381.

The square root of 18320411655225 is 4280235.

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

18320411655225 is a `hidden beast` number, since 1 + 8 + 3 + 2 + 0 + 4 + 116 + 5 + 522 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6595348195881 + 11725063459344 = 2568141^2 + 3424188^2 .

It is not a de Polignac number, because 18320411655225 - 2¹¹ = 18320411653177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4558448266 + ... + 4558452284.

Almost surely, 2^{18320411655225} is an apocalyptic number.

18320411655225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18320411655225 is the 4280235-th square number.

18320411655225 is the 2140118-th centered octagonal number.

It is an amenable number.

18320411655225 is a deficient number, since it is larger than the sum of its proper divisors (14970441494134).

18320411655225 is an frugal number, since it uses more digits than its factorization.

18320411655225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8196 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 18320411655225 in words is "eighteen trillion, three hundred twenty billion, four hundred eleven million, six hundred fifty-five thousand, two hundred twenty-five".