User blog comment:OWOPKekistan/Yoctoduodecillion/@comment-43798125-20191013151813

This isn't quite upper class 3 -- upper class 3 goes from ~a googolplex (10^10^100) to ~10^10^1000000, while Yoctoduodecillion, even in the long scale, is ~10^(6*(10^25)), which is < a googolplex