18609052225 has 9 divisors (see below), whose sum is σ = 23076070563. Its totient is φ = 14886696120.

The previous prime is 18609052223. The next prime is 18609052247. The reversal of 18609052225 is 52225090681.

The square root of 18609052225 is 136415.

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., 6699258801 + 11909793424 = 81849^2 + 109132^2 .

It is not a de Polignac number, because 18609052225 - 2¹ = 18609052223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18609052223) 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, 668434 + ... + 695716.

Almost surely, 2^18609052225 is an apocalyptic number.

18609052225 is the 136415-th square number.

18609052225 is the 68208-th centered octagonal number.

It is an amenable number.

18609052225 is a deficient number, since it is larger than the sum of its proper divisors (4467018338).

18609052225 is an frugal number, since it uses more digits than its factorization.

18609052225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54576 (or 27288 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 18609052225 in words is "eighteen billion, six hundred nine million, fifty-two thousand, two hundred twenty-five".