There really aren't a quadrupillion of anything. not anything physical anyway. The number of particles in the visible universe is only on the order of 10^80.
Of course there are some examples. There's a quadrupillion ways to organize N balls into M separate piles (for some values of N and M which I'm too lazy to figure out now). There's a quadrupillion possible English sentences of less than M' words.
A six-year-old, even a clever one, doesn't really have the capabilities to understand these kinds of scales though. In fact, you can see from the fact that he chose "a hundred" as a big number which could be added to a googolplex that he's still at the age where he thinks "a hundred" is a huge number. I remember being that age too.
