18113122225 has 27 divisors (see below), whose sum is σ = 24697829611. Its totient is φ = 13167796400.

The previous prime is 18113122211. The next prime is 18113122253. The reversal of 18113122225 is 52222131181.

The square root of 18113122225 is 134585.

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., 6520724001 + 11592398224 = 80751^2 + 107668^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18113122225 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18113122193 and 18113122202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7400952 + ... + 7403398.

Almost surely, 2^18113122225 is an apocalyptic number.

18113122225 is the 134585-th square number.

18113122225 is the 67293-rd centered octagonal number.

It is an amenable number.

18113122225 is a deficient number, since it is larger than the sum of its proper divisors (6584707386).

18113122225 is an frugal number, since it uses more digits than its factorization.

18113122225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4926 (or 2463 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The spelling of 18113122225 in words is "eighteen billion, one hundred thirteen million, one hundred twenty-two thousand, two hundred twenty-five".