18522251725 has 12 divisors (see below), whose sum is σ = 22973390100. Its totient is φ = 14814060800.

The previous prime is 18522251681. The next prime is 18522251749. The reversal of 18522251725 is 52715222581.

It can be written as a sum of positive squares in 6 ways, for example, as 5135298921 + 13386952804 = 71661^2 + 115702^2 .

It is not a de Polignac number, because 18522251725 - 2²¹ = 18520154573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9735 + ... + 192715.

It is an arithmetic number, because the mean of its divisors is an integer number (1914449175).

Almost surely, 2^18522251725 is an apocalyptic number.

It is an amenable number.

18522251725 is a deficient number, since it is larger than the sum of its proper divisors (4451138375).

18522251725 is a wasteful number, since it uses less digits than its factorization.

18522251725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187040 (or 187035 counting only the distinct ones).

The product of its digits is 112000, while the sum is 40.

The spelling of 18522251725 in words is "eighteen billion, five hundred twenty-two million, two hundred fifty-one thousand, seven hundred twenty-five".