The estimates in the article are on the order of 10^61 erg (not sure why they used this unit), which is around 10^54 Joule, or 10^42 kilotons. Even the biggest nukes are below 10^5 kiloton, so this would be about 10^37 of them.
Not that you'd ever get that many because 10^61 is about 10^7 solar masses worth of energy.
Edit: Apparently this monster was the infamous "Backyard" bomb - "since that particular design would probably kill everyone on Earth, there was no use carting it anywhere."
Not that you'd ever get that many because 10^61 is about 10^7 solar masses worth of energy.