18000111900691 has 2 divisors, whose sum is σ = 18000111900692. Its totient is φ = 18000111900690.

The previous prime is 18000111900671. The next prime is 18000111900703. The reversal of 18000111900691 is 19600911100081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18000111900691 - 2³⁹ = 17450356086803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18000111900691.

It is not a weakly prime, because it can be changed into another prime (18000111900671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000055950345 + 9000055950346.

It is an arithmetic number, because the mean of its divisors is an integer number (9000055950346).

Almost surely, 2^{18000111900691} is an apocalyptic number.

18000111900691 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000111900691 is an equidigital number, since it uses as much as digits as its factorization.

18000111900691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 37.

The spelling of 18000111900691 in words is "eighteen trillion, one hundred eleven million, nine hundred thousand, six hundred ninety-one".