Ontological argument (oa)
God is that than which nothing greater can be conceived
The largest number is that than which no greater can be conceived
But for any given number I can conceive a greater
The oa is also not an argument for one god. It is not that god is that than which nothing equally great can be conceived.
For any large number I can conceive of other numbers equally large. Eg 2 Equivalents 2.0, 2.00, 2/1, etc. or sets 2 chairs, 2 torches, 2 books, etc.