HP Prime CAS & Large numbers

[Bipman]

Hi

I've been looking on the internet for answers to this question but can't find anything. When using the CAS for very large numbers for example (256^256)*2^40, how do I convert this to scientific format (exact or otherwise)? I can do it online of course but wondered if I can do it on the calculator. I've tried setting scientific format with say 8 digits but it doesn't do anything and of course if I copy the number to the home screen I just get infinity.

Bipman