18369736225 has 9 divisors (see below), whose sum is σ = 22779313267. Its totient is φ = 14695246840.

The previous prime is 18369736213. The next prime is 18369736243. The reversal of 18369736225 is 52263796381.

The square root of 18369736225 is 135535.

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., 6613105041 + 11756631184 = 81321^2 + 108428^2 .

It is not a de Polignac number, because 18369736225 - 2¹³ = 18369728033 is a prime.

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, 664122 + ... + 691228.

Almost surely, 2^18369736225 is an apocalyptic number.

18369736225 is the 135535-th square number.

18369736225 is the 67768-th centered octagonal number.

It is an amenable number.

18369736225 is a deficient number, since it is larger than the sum of its proper divisors (4409577042).

18369736225 is an frugal number, since it uses more digits than its factorization.

18369736225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54224 (or 27112 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 52.

The spelling of 18369736225 in words is "eighteen billion, three hundred sixty-nine million, seven hundred thirty-six thousand, two hundred twenty-five".