What programming language will enable me to enter a very long number without converting it to floating point?

Question

What would be the best way to do the following.

Enter a very long number, lets say 500,000 digits long without it going into scientific notation; and then am able to

Answer 1

Python does this out of the box with no special library. So does 'bc' (which is a full programming language masquerading as a calculator) for Unix systems.