217585960897 has 2 divisors, whose sum is σ = 217585960898. Its totient is φ = 217585960896.

The previous prime is 217585960877. The next prime is 217585960927. The reversal of 217585960897 is 798069585712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124761542656 + 92824418241 = 353216^2 + 304671^2 .

It is a cyclic number.

It is not a de Polignac number, because 217585960897 - 2³¹ = 215438477249 is a prime.

It is not a weakly prime, because it can be changed into another prime (217585960817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108792980448 + 108792980449.

It is an arithmetic number, because the mean of its divisors is an integer number (108792980449).

Almost surely, 2^217585960897 is an apocalyptic number.

It is an amenable number.

217585960897 is a deficient number, since it is larger than the sum of its proper divisors (1).

217585960897 is an equidigital number, since it uses as much as digits as its factorization.

217585960897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 76204800, while the sum is 67.

The spelling of 217585960897 in words is "two hundred seventeen billion, five hundred eighty-five million, nine hundred sixty thousand, eight hundred ninety-seven".