Second paragraph of third chapter:

I’m in my desk chair, turned to face the bed. Eight is sitting up now, leaning forward with his head in his hands. I know how he feels. Waking up straight out of the tank is like the world’s worst hangover, with little bits of leprosy and the bends mixed in for flavor.

From the front cover, spine and headers, it looks to me like the number in the title is intended to be superscript – Mickey⁷ – though the narrator is always referred to as Mickey7 in the text, with no superscript.

I enjoyed this. If you ever played the RPG Paranoia at any stage you’ll appreciate the premise; the narrator is the latest in a series of clones established to help colonise a hostile planet, and faces lethal challenges from his fellow colonisers. The ending left some things unresolved, but I found it satisfactory all the same. You can get it here.