User blog comment:Superman37891/PEPTO BISMOL/@comment-30754445-20170427172623

The only reason that number is not a salad number, is that it isn't well-defined at all. And had you defined PEPTO(x) properly... well, then you'll have a salad number. Mixing BIG FOOT and PEPTO makes a salad. Indeed, BIG FOOT is a number so incredibly vast, that the result of repeating your PEPTO function a BIG FOOT times would be indistinguishable from BIG FOOT itself.

By the way, I see that your PEPTO function is based on the physical universe. This kind of thing isn't very useful in googology, because the physical universe is too small. Any number based on physics will be smaller than a power tower of a handful of 10's.