18098945791999 has 4 divisors (see below), whose sum is σ = 18519851508136. Its totient is φ = 17678040075864.

The previous prime is 18098945791991. The next prime is 18098945792021. The reversal of 18098945791999 is 99919754989081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18098945791999 - 2³ = 18098945791991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18098945791991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210452858004 + ... + 210452858089.

It is an arithmetic number, because the mean of its divisors is an integer number (4629962877034).

Almost surely, 2^{18098945791999} is an apocalyptic number.

18098945791999 is a deficient number, since it is larger than the sum of its proper divisors (420905716137).

18098945791999 is an equidigital number, since it uses as much as digits as its factorization.

18098945791999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420905716136.

The product of its (nonzero) digits is 4761711360, while the sum is 88.

The spelling of 18098945791999 in words is "eighteen trillion, ninety-eight billion, nine hundred forty-five million, seven hundred ninety-one thousand, nine hundred ninety-nine".