What are the biggest numbers Construct can handle?

I'm working on an encryption system that uses some... quite big numbers. How far up can Construct go without rounding, and if it can't go far enough, is there a way around it?

I'm not sure how high,

but the way around it if the user doesn't need access to the large numbers (keys) at runtime

would be to write a plugin for it, or maybe use python

you could setting a private variable a few numbers from the top end of your spectrum, and then outputting the private variable to a text box, and see if the number is in tact

Oh yeah, text. Thanks.