Need to autofill showing Excel cell number location...

By that I mean I need to fill in a vast amount of cells with the actual cell number. So for example if I look at cell C1 it would have the text C1 in that cell. I will using this as sort of a template. Is there a way I can autofill all the rows and columns needed for this? Right now I am just manually dragging to autofill and I have hundreds of rows and columns to fill.

Thx for any help!