18409938593 has 2 divisors, whose sum is σ = 18409938594. Its totient is φ = 18409938592.

The previous prime is 18409938581. The next prime is 18409938611. The reversal of 18409938593 is 39583990481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11053788769 + 7356149824 = 105137^2 + 85768^2 .

It is a cyclic number.

It is not a de Polignac number, because 18409938593 - 2¹² = 18409934497 is a prime.

It is not a weakly prime, because it can be changed into another prime (18409938523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9204969296 + 9204969297.

It is an arithmetic number, because the mean of its divisors is an integer number (9204969297).

Almost surely, 2^18409938593 is an apocalyptic number.

It is an amenable number.

18409938593 is a deficient number, since it is larger than the sum of its proper divisors (1).

18409938593 is an equidigital number, since it uses as much as digits as its factorization.

18409938593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 18409938593 in words is "eighteen billion, four hundred nine million, nine hundred thirty-eight thousand, five hundred ninety-three".