18305688125 has 40 divisors (see below), whose sum is σ = 23790728280. Its totient is φ = 14063616000.

The previous prime is 18305688119. The next prime is 18305688127. The reversal of 18305688125 is 52188650381.

It is a happy number.

It can be written as a sum of positive squares in 20 ways, for example, as 16892980729 + 1412707396 = 129973^2 + 37586^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18305688125 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18305688125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18305688127) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3495509 + ... + 3500741.

It is an arithmetic number, because the mean of its divisors is an integer number (594768207).

Almost surely, 2^18305688125 is an apocalyptic number.

It is an amenable number.

18305688125 is a deficient number, since it is larger than the sum of its proper divisors (5485040155).

18305688125 is an equidigital number, since it uses as much as digits as its factorization.

18305688125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475 (or 5460 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 47.

The spelling of 18305688125 in words is "eighteen billion, three hundred five million, six hundred eighty-eight thousand, one hundred twenty-five".