18193940339 has 2 divisors, whose sum is σ = 18193940340. Its totient is φ = 18193940338.

The previous prime is 18193940327. The next prime is 18193940357. The reversal of 18193940339 is 93304939181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18193940339 - 2²⁰ = 18192891763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18193946339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9096970169 + 9096970170.

It is an arithmetic number, because the mean of its divisors is an integer number (9096970170).

Almost surely, 2^18193940339 is an apocalyptic number.

18193940339 is a deficient number, since it is larger than the sum of its proper divisors (1).

18193940339 is an equidigital number, since it uses as much as digits as its factorization.

18193940339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 18193940339 in words is "eighteen billion, one hundred ninety-three million, nine hundred forty thousand, three hundred thirty-nine".