18318643207 has 2 divisors, whose sum is σ = 18318643208. Its totient is φ = 18318643206.

The previous prime is 18318643159. The next prime is 18318643219. The reversal of 18318643207 is 70234681381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18318643207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18318043207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159321603 + 9159321604.

It is an arithmetic number, because the mean of its divisors is an integer number (9159321604).

Almost surely, 2^18318643207 is an apocalyptic number.

18318643207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318643207 is an equidigital number, since it uses as much as digits as its factorization.

18318643207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 18318643207 in words is "eighteen billion, three hundred eighteen million, six hundred forty-three thousand, two hundred seven".