18240023211911 has 2 divisors, whose sum is σ = 18240023211912. Its totient is φ = 18240023211910.

The previous prime is 18240023211853. The next prime is 18240023211913. The reversal of 18240023211911 is 11911232004281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18240023211911 - 2¹⁰ = 18240023210887 is a prime.

Together with 18240023211913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18240023211913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120011605955 + 9120011605956.

It is an arithmetic number, because the mean of its divisors is an integer number (9120011605956).

Almost surely, 2^{18240023211911} is an apocalyptic number.

18240023211911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240023211911 is an equidigital number, since it uses as much as digits as its factorization.

18240023211911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 18240023211911 in words is "eighteen trillion, two hundred forty billion, twenty-three million, two hundred eleven thousand, nine hundred eleven".