Write bigger number then previous poster

7
(I've never been very good at following instructions...)

770000037862997369.
Bigger than @NeuralGnat's number.

7700000378629973696.

This is math at its finest

I've once designed the number ipfostigid, which is the number digitsofpi reversed. It's a so called ininitiate number. Here goes:

.....................................51413

IPFOSTIGID

Rayo's number!

googol bang bang stack plex stack

Checkmath.

I've come up with a most intriguing variant.

.....................................514131211

I wonder what it is.