18091624594991 has 2 divisors, whose sum is σ = 18091624594992. Its totient is φ = 18091624594990.

The previous prime is 18091624594987. The next prime is 18091624595053. The reversal of 18091624594991 is 19949542619081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18091624594991 - 2² = 18091624594987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18091624594931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9045812297495 + 9045812297496.

It is an arithmetic number, because the mean of its divisors is an integer number (9045812297496).

Almost surely, 2^{18091624594991} is an apocalyptic number.

18091624594991 is a deficient number, since it is larger than the sum of its proper divisors (1).

18091624594991 is an equidigital number, since it uses as much as digits as its factorization.

18091624594991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50388480, while the sum is 68.

The spelling of 18091624594991 in words is "eighteen trillion, ninety-one billion, six hundred twenty-four million, five hundred ninety-four thousand, nine hundred ninety-one".