well, keep in mind, the Hiroshima bomb was around 15kt or so. Today we have bombs that are way more powerful, or at least I think we do. We have H Bombs, MIRVs, thermonuclear, etc... We have yields ion the megaton range. kt is 1000 tons, mt is 1000000 tons, so some of the bombs we have today are.
Our largest yield is apparently the B83 that has 1.2MT or 1200kt yield. That’s 80X more powerful than the Hiroshima bomb.
So, the bombs today would probably take out way more than 166,000 per warhead. If you multiply it by 80, you get around 13M, enough to say goodbye to Beijing.