There is no largest number under infinity because what ever the highest number is, one can always be added to it, making the new number the highest number.
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A googolplex which has a googol zeros (a googol has 100 zeros after it) is a big one, but there is no "highest number", because you can always add one to it. Some people believe infinity is the highest number, but you can always just add one.
898
The largest named number that is commonly known is a googolplex. A googol is 10^100 (a one with 100 zeros after it) and a googolplex is 10^googol. Under the traditional naming system of million, billion, trillion, the largest named number is Centillion, which is 10^303 (a one with 303 zeros after it). The largest denomination banknote ever printed was for 1 sextillion (10^21). In science, some large numbers used are Avogadro's number (6.022 x 10^23), which defines the number of molecules in a mole; Graham's number (unimaginably large), which is the upper bound of connections between vertices of hypercubes.
The bottom number. The number under or after the fraction bar.
No Q is not cyclic under addition.