18399810249959 has 2 divisors, whose sum is σ = 18399810249960. Its totient is φ = 18399810249958.

The previous prime is 18399810249871. The next prime is 18399810249983. The reversal of 18399810249959 is 95994201899381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18399810249959 - 2¹² = 18399810245863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18399810249959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18399810245959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199905124979 + 9199905124980.

It is an arithmetic number, because the mean of its divisors is an integer number (9199905124980).

Almost surely, 2^{18399810249959} is an apocalyptic number.

18399810249959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18399810249959 is an equidigital number, since it uses as much as digits as its factorization.

18399810249959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453496320, while the sum is 77.

The spelling of 18399810249959 in words is "eighteen trillion, three hundred ninety-nine billion, eight hundred ten million, two hundred forty-nine thousand, nine hundred fifty-nine".