18217396343 has 2 divisors, whose sum is σ = 18217396344. Its totient is φ = 18217396342.

The previous prime is 18217396339. The next prime is 18217396363. The reversal of 18217396343 is 34369371281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18217396343 - 2² = 18217396339 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18217396303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9108698171 + 9108698172.

It is an arithmetic number, because the mean of its divisors is an integer number (9108698172).

Almost surely, 2^18217396343 is an apocalyptic number.

18217396343 is a deficient number, since it is larger than the sum of its proper divisors (1).

18217396343 is an equidigital number, since it uses as much as digits as its factorization.

18217396343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The spelling of 18217396343 in words is "eighteen billion, two hundred seventeen million, three hundred ninety-six thousand, three hundred forty-three".