20117556164611 has 2 divisors, whose sum is σ = 20117556164612. Its totient is φ = 20117556164610.

The previous prime is 20117556164551. The next prime is 20117556164659. The reversal of 20117556164611 is 11646165571102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20117556164611 - 2⁹ = 20117556164099 is a prime.

It is not a weakly prime, because it can be changed into another prime (20117556164311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058778082305 + 10058778082306.

It is an arithmetic number, because the mean of its divisors is an integer number (10058778082306).

Almost surely, 2^{20117556164611} is an apocalyptic number.

20117556164611 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117556164611 is an equidigital number, since it uses as much as digits as its factorization.

20117556164611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 20117556164611 in words is "twenty trillion, one hundred seventeen billion, five hundred fifty-six million, one hundred sixty-four thousand, six hundred eleven".