20117563344191 has 2 divisors, whose sum is σ = 20117563344192. Its totient is φ = 20117563344190.

The previous prime is 20117563344113. The next prime is 20117563344211. The reversal of 20117563344191 is 19144336571102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20117563344191 - 2¹⁰ = 20117563343167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20117563344101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058781672095 + 10058781672096.

It is an arithmetic number, because the mean of its divisors is an integer number (10058781672096).

Almost surely, 2^{20117563344191} is an apocalyptic number.

20117563344191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117563344191 is an equidigital number, since it uses as much as digits as its factorization.

20117563344191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 20117563344191 in words is "twenty trillion, one hundred seventeen billion, five hundred sixty-three million, three hundred forty-four thousand, one hundred ninety-one".