I think that there should be a limit to numbers. I think the number of Planck volumes in the universe should be the upper limit for numbers (which I think is 1.92 x 10^184 for the observable universe). This would mean there should be no numbers an order of magnitude bigger than googol (e.g. googolplex) as there is no need for them. Numbers like this will never count anything. I know we do not yet know the number of Planck volumes in the whole universe but whatever number it is should be the limit.