18661424208023 has 2 divisors, whose sum is σ = 18661424208024. Its totient is φ = 18661424208022.

The previous prime is 18661424207893. The next prime is 18661424208047. The reversal of 18661424208023 is 32080242416681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18661424208023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18661424208083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9330712104011 + 9330712104012.

It is an arithmetic number, because the mean of its divisors is an integer number (9330712104012).

Almost surely, 2^{18661424208023} is an apocalyptic number.

18661424208023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18661424208023 is an equidigital number, since it uses as much as digits as its factorization.

18661424208023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 884736, while the sum is 47.

The spelling of 18661424208023 in words is "eighteen trillion, six hundred sixty-one billion, four hundred twenty-four million, two hundred eight thousand, twenty-three".