18309279913 has 2 divisors, whose sum is σ = 18309279914. Its totient is φ = 18309279912.

The previous prime is 18309279893. The next prime is 18309280009. The reversal of 18309279913 is 31997290381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17579577744 + 729702169 = 132588^2 + 27013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18309279913 is a prime.

It is not a weakly prime, because it can be changed into another prime (18309279013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9154639956 + 9154639957.

It is an arithmetic number, because the mean of its divisors is an integer number (9154639957).

Almost surely, 2^18309279913 is an apocalyptic number.

It is an amenable number.

18309279913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18309279913 is an equidigital number, since it uses as much as digits as its factorization.

18309279913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 18309279913 in words is "eighteen billion, three hundred nine million, two hundred seventy-nine thousand, nine hundred thirteen".