18309011923 has 2 divisors, whose sum is σ = 18309011924. Its totient is φ = 18309011922.

The previous prime is 18309011911. The next prime is 18309011969. The reversal of 18309011923 is 32911090381.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18309011923 is a prime.

It is not a weakly prime, because it can be changed into another prime (18309011993) 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, 9154505961 + 9154505962.

It is an arithmetic number, because the mean of its divisors is an integer number (9154505962).

Almost surely, 2^18309011923 is an apocalyptic number.

18309011923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18309011923 is an equidigital number, since it uses as much as digits as its factorization.

18309011923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The spelling of 18309011923 in words is "eighteen billion, three hundred nine million, eleven thousand, nine hundred twenty-three".