18091676418649 has 2 divisors, whose sum is σ = 18091676418650. Its totient is φ = 18091676418648.

The previous prime is 18091676418617. The next prime is 18091676418719. The reversal of 18091676418649 is 94681467619081.

It is an a-pointer prime, because the next prime (18091676418719) can be obtained adding 18091676418649 to its sum of digits (70).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14553515418649 + 3538161000000 = 3814907^2 + 1881000^2 .

It is a cyclic number.

It is not a de Polignac number, because 18091676418649 - 2⁵ = 18091676418617 is a prime.

It is not a weakly prime, because it can be changed into another prime (18091676415649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9045838209324 + 9045838209325.

It is an arithmetic number, because the mean of its divisors is an integer number (9045838209325).

Almost surely, 2^{18091676418649} is an apocalyptic number.

It is an amenable number.

18091676418649 is a deficient number, since it is larger than the sum of its proper divisors (1).

18091676418649 is an equidigital number, since it uses as much as digits as its factorization.

18091676418649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125411328, while the sum is 70.

The spelling of 18091676418649 in words is "eighteen trillion, ninety-one billion, six hundred seventy-six million, four hundred eighteen thousand, six hundred forty-nine".