Put it this way: If you took a proton, and magnified it by 1e186, the entire universe would be really, incredibly, negligibly small next to it. Tinier than anything you could possibly imagine.
That's the best I could come up with. You're really dealing with quantities most people are incapable of comprehending here. But comparisons like this are just a keyword, they can be just as meaningless if you can't imagine what a "proton" or "size of the universe" implies. I have a very poor grasp of any quantity beyond 1e|9| myself - that's the approximate border where numbers stop being intuitive quantities and turn into abstract concepts.