I did manage to squeeze by and ended up with several hundred million. I was making a really pretty city too, but when I loaded the game it ended up deleting a lot of the objects. Roads, streetlights, barrels, many utility buildings. I didnt lose any characters but it did make me too disheartened to work on it more.
Admittedly, I did use the grass texture for an entire half of the map so maybe thats partly my fault...