217884345313897 has 2 divisors, whose sum is σ = 217884345313898. Its totient is φ = 217884345313896.

The previous prime is 217884345313837. The next prime is 217884345313949. The reversal of 217884345313897 is 798313543488712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160139179561321 + 57745165752576 = 12654611^2 + 7599024^2 .

It is a cyclic number.

It is not a de Polignac number, because 217884345313897 - 2¹⁹ = 217884344789609 is a prime.

It is a super-2 number, since 2×217884345313897² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (217884345313837) 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, 108942172656948 + 108942172656949.

It is an arithmetic number, because the mean of its divisors is an integer number (108942172656949).

Almost surely, 2^{217884345313897} is an apocalyptic number.

It is an amenable number.

217884345313897 is a deficient number, since it is larger than the sum of its proper divisors (1).

217884345313897 is an equidigital number, since it uses as much as digits as its factorization.

217884345313897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 975421440, while the sum is 73.

The spelling of 217884345313897 in words is "two hundred seventeen trillion, eight hundred eighty-four billion, three hundred forty-five million, three hundred thirteen thousand, eight hundred ninety-seven".