18318643159 has 2 divisors, whose sum is σ = 18318643160. Its totient is φ = 18318643158.

The previous prime is 18318643087. The next prime is 18318643207. The reversal of 18318643159 is 95134681381.

It is a strong prime.

It is an emirp because it is prime and its reverse (95134681381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18318643159 - 2¹³ = 18318634967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18318647159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159321579 + 9159321580.

It is an arithmetic number, because the mean of its divisors is an integer number (9159321580).

Almost surely, 2^18318643159 is an apocalyptic number.

18318643159 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318643159 is an equidigital number, since it uses as much as digits as its factorization.

18318643159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The spelling of 18318643159 in words is "eighteen billion, three hundred eighteen million, six hundred forty-three thousand, one hundred fifty-nine".