18597225121 has 4 divisors (see below), whose sum is σ = 18606215700. Its totient is φ = 18588234544.

The previous prime is 18597225083. The next prime is 18597225131. The reversal of 18597225121 is 12152279581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5865262225 + 12731962896 = 76585^2 + 112836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18597225121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18597225131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4492186 + ... + 4496323.

It is an arithmetic number, because the mean of its divisors is an integer number (4651553925).

Almost surely, 2^18597225121 is an apocalyptic number.

It is an amenable number.

18597225121 is a deficient number, since it is larger than the sum of its proper divisors (8990579).

18597225121 is an equidigital number, since it uses as much as digits as its factorization.

18597225121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8990578.

The product of its digits is 100800, while the sum is 43.

The spelling of 18597225121 in words is "eighteen billion, five hundred ninety-seven million, two hundred twenty-five thousand, one hundred twenty-one".