10,951 Pages

A googolstackstackplex is equal to $$10^{10\uparrow\uparrow10\uparrow\uparrow10^{100}}$$ or $$10^{\text{googolstackstack}}$$ or $$10\uparrow\uparrow(10\uparrow\uparrow(10^{100})+1)$$,[1] or 10 raised to the power of 10 tetrated to 10 tetrated to a googol.