User blog comment:Angrybirdstd/Crispin/@comment-32783837-20180202024541/@comment-30754445-20180204074339

It looks like he is using "powten" as an unary function. Taking it literally, I assume powten(x)=10^x.

So the number is well-defined. It's almost exactly equal to E63#1003 (with the vigintilliusmilliplex itself being E63#1002).

It's still a salad, though. Even the "vigintillius" part is pretty redundant, as Saibian's suffix of "milliplex" is the main source of the number's size.