18309011911 has 2 divisors, whose sum is σ = 18309011912. Its totient is φ = 18309011910.

The previous prime is 18309011887. The next prime is 18309011923. The reversal of 18309011911 is 11911090381.

It is a strong prime.

It is an emirp because it is prime and its reverse (11911090381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18309011911 - 2²³ = 18300623303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18309051911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9154505955 + 9154505956.

It is an arithmetic number, because the mean of its divisors is an integer number (9154505956).

Almost surely, 2^18309011911 is an apocalyptic number.

18309011911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18309011911 is an equidigital number, since it uses as much as digits as its factorization.

18309011911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 34.

The spelling of 18309011911 in words is "eighteen billion, three hundred nine million, eleven thousand, nine hundred eleven".