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 do math with it, like +2 etc.?

Thank you in advance.

EDIT: It is a 500,000 digit, positive integer.

Answer 1

Python and Java have native support, libraries exist for C++, C, .NET, ...