217018819711697 has 2 divisors, whose sum is σ = 217018819711698. Its totient is φ = 217018819711696.

The previous prime is 217018819711679. The next prime is 217018819711709. The reversal of 217018819711697 is 796117918810712.

Together with previous prime (217018819711679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217003804640401 + 15015071296 = 14731049^2 + 122536^2 .

It is a cyclic number.

It is not a de Polignac number, because 217018819711697 - 2¹² = 217018819707601 is a prime.

It is not a weakly prime, because it can be changed into another prime (217018819716697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108509409855848 + 108509409855849.

It is an arithmetic number, because the mean of its divisors is an integer number (108509409855849).

Almost surely, 2^{217018819711697} is an apocalyptic number.

It is an amenable number.

217018819711697 is a deficient number, since it is larger than the sum of its proper divisors (1).

217018819711697 is an equidigital number, since it uses as much as digits as its factorization.

217018819711697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21337344, while the sum is 68.

The spelling of 217018819711697 in words is "two hundred seventeen trillion, eighteen billion, eight hundred nineteen million, seven hundred eleven thousand, six hundred ninety-seven".