18138423713 has 4 divisors (see below), whose sum is σ = 18304831380. Its totient is φ = 17972016048.

The previous prime is 18138423697. The next prime is 18138423727. The reversal of 18138423713 is 31732483181.

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 11141435809 + 6996987904 = 105553^2 + 83648^2 .

It is a cyclic number.

It is not a de Polignac number, because 18138423713 - 2⁴ = 18138423697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18138473713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83203670 + ... + 83203887.

It is an arithmetic number, because the mean of its divisors is an integer number (4576207845).

Almost surely, 2^18138423713 is an apocalyptic number.

It is an amenable number.

18138423713 is a deficient number, since it is larger than the sum of its proper divisors (166407667).

18138423713 is a wasteful number, since it uses less digits than its factorization.

18138423713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166407666.

The product of its digits is 96768, while the sum is 41.

The spelling of 18138423713 in words is "eighteen billion, one hundred thirty-eight million, four hundred twenty-three thousand, seven hundred thirteen".