Hi.
I would suggest you keep a maximum of 4 tracks for each render. For example, render the 16, grab that render and place 4 of those inside the 64 to build it. Render the 64, grab 4 of those and place them inside the 256. Render the 256 and place 4 inside the 1024, and so on. This way you will not need ( and no machine would be able to do it ) to have billions of instances of the same video.
Hope it helps