User blog comment:Legionwrex/I figured out how many Reapers there are!/@comment-1679409-20120801033742

I'm not going to get into whether or not your estimate is right, but I want to point out that, if accurate, your estimation is for the number of Reapers ever created. Remember that they're not invincible. Shepard takes down three Reapers himself. The turians are able to take down a couple as well. And of course we had Sovereign. And that's just one cycle.

We also know that some unnamed species destroyed the Reaper we know as the Derelict Reaper. I would imagine the Protheans took down a few Reapers, too.