18613217125 has 16 divisors (see below), whose sum is σ = 24595726896. Its totient is φ = 14014656000.

The previous prime is 18613217113. The next prime is 18613217141. The reversal of 18613217125 is 52171231681.

It can be written as a sum of positive squares in 8 ways, for example, as 2687281921 + 15925935204 = 51839^2 + 126198^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18613217125 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4377456 + ... + 4381705.

It is an arithmetic number, because the mean of its divisors is an integer number (1537232931).

Almost surely, 2^18613217125 is an apocalyptic number.

It is an amenable number.

18613217125 is a deficient number, since it is larger than the sum of its proper divisors (5982509771).

18613217125 is an equidigital number, since it uses as much as digits as its factorization.

18613217125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8759193 (or 8759183 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The spelling of 18613217125 in words is "eighteen billion, six hundred thirteen million, two hundred seventeen thousand, one hundred twenty-five".