18318478319 has 2 divisors, whose sum is σ = 18318478320. Its totient is φ = 18318478318.

The previous prime is 18318478301. The next prime is 18318478393. The reversal of 18318478319 is 91387481381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18318478319 - 2²⁰ = 18317429743 is a prime.

It is a super-2 number, since 2×18318478319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18318478019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159239159 + 9159239160.

It is an arithmetic number, because the mean of its divisors is an integer number (9159239160).

Almost surely, 2^18318478319 is an apocalyptic number.

18318478319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318478319 is an equidigital number, since it uses as much as digits as its factorization.

18318478319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 53.

The spelling of 18318478319 in words is "eighteen billion, three hundred eighteen million, four hundred seventy-eight thousand, three hundred nineteen".