18318478439 has 2 divisors, whose sum is σ = 18318478440. Its totient is φ = 18318478438.

The previous prime is 18318478393. The next prime is 18318478441. The reversal of 18318478439 is 93487481381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18318478439 is a prime.

Together with 18318478441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18318478039) by changing a digit.

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 as a sum of consecutive naturals, namely, 9159239219 + 9159239220.

It is an arithmetic number, because the mean of its divisors is an integer number (9159239220).

Almost surely, 2^18318478439 is an apocalyptic number.

18318478439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318478439 is an equidigital number, since it uses as much as digits as its factorization.

18318478439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 56.

The spelling of 18318478439 in words is "eighteen billion, three hundred eighteen million, four hundred seventy-eight thousand, four hundred thirty-nine".