Is there any way you could calculate the unfunded liabilities programming?

I tried to calculate the national debt in my program, including unfunded liabilities, and I was not able to. Is there any way you could do this in any programming language? My only idea would be to divide it until it is manageable then maybe recompile somehow. I kind of see why Yahoo Finance goes up to only a few hundred thousand.
Thanks
(This is not a personal programming question, rather a general question)

try using 64 bit unsigned integers if 32 bit ints are overflowing. If a 64bit unsigned cant handle it then you're going to have to break it down.

Thanks