18364779913 has 2 divisors, whose sum is σ = 18364779914. Its totient is φ = 18364779912.

The previous prime is 18364779877. The next prime is 18364779929. The reversal of 18364779913 is 31997746381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18250118649 + 114661264 = 135093^2 + 10708^2 .

It is an emirp because it is prime and its reverse (31997746381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18364779913 is a prime.

It is not a weakly prime, because it can be changed into another prime (18364779613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182389956 + 9182389957.

It is an arithmetic number, because the mean of its divisors is an integer number (9182389957).

Almost surely, 2^18364779913 is an apocalyptic number.

It is an amenable number.

18364779913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18364779913 is an equidigital number, since it uses as much as digits as its factorization.

18364779913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 58.

The spelling of 18364779913 in words is "eighteen billion, three hundred sixty-four million, seven hundred seventy-nine thousand, nine hundred thirteen".