216913644317 has 2 divisors, whose sum is σ = 216913644318. Its totient is φ = 216913644316.

The previous prime is 216913644263. The next prime is 216913644359. The reversal of 216913644317 is 713446319612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214530154276 + 2383490041 = 463174^2 + 48821^2 .

It is a cyclic number.

It is not a de Polignac number, because 216913644317 - 2¹⁰ = 216913643293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216913644517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108456822158 + 108456822159.

It is an arithmetic number, because the mean of its divisors is an integer number (108456822159).

Almost surely, 2^216913644317 is an apocalyptic number.

It is an amenable number.

216913644317 is a deficient number, since it is larger than the sum of its proper divisors (1).

216913644317 is an equidigital number, since it uses as much as digits as its factorization.

216913644317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The spelling of 216913644317 in words is "two hundred sixteen billion, nine hundred thirteen million, six hundred forty-four thousand, three hundred seventeen".