20116717653217 has 2 divisors, whose sum is σ = 20116717653218. Its totient is φ = 20116717653216.

The previous prime is 20116717653191. The next prime is 20116717653247. The reversal of 20116717653217 is 71235671761102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19454592061696 + 662125591521 = 4410736^2 + 813711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20116717653217 is a prime.

It is not a weakly prime, because it can be changed into another prime (20116717653247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058358826608 + 10058358826609.

It is an arithmetic number, because the mean of its divisors is an integer number (10058358826609).

Almost surely, 2^{20116717653217} is an apocalyptic number.

It is an amenable number.

20116717653217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116717653217 is an equidigital number, since it uses as much as digits as its factorization.

20116717653217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 740880, while the sum is 49.

The spelling of 20116717653217 in words is "twenty trillion, one hundred sixteen billion, seven hundred seventeen million, six hundred fifty-three thousand, two hundred seventeen".