1.1018167633369394697...

This number is neither prime nor composite.

                                                 1.101 8167633369 3946974...

The regularized product (2^2)(3^3)(5^5)(7^7) etc., i.e., two to the power of two, multiplied by three to the power of three, multiplied by five to the power of five, and so on for all prime numbers. It is e to the power of the negative of the derivative of the prime zeta function at -1. [Hinger]