User blog comment:Legionwrex/I figured out how many Reapers there are!/@comment-70.16.67.59-20120807034303

We only know that the Leviathan is nearly 1 billion years old. My guess is that there are Reapers far older. So unless the Leviathan was the very first Reaper (which I doubt) There are MANY more than 18k reapers