Another experiment, which narrows the possibilities somewhat...

   JVERSION
Engine: j701/2011-01-10/11:25 build: Feb  6 2011 16:16:29
Library: 7.01.043
Platform: Darwin 64
Installer: j701a_mac64.dmg

InstallPath: /Applications/j64-701

   factors 576460752303423487x
179951 3203431780337
   179951 * 3203431780337      NB. This is really paranoid!
576460752303423487
   zzz=:179951 * 3203431780337
   zzz
576460752303423487
   (zzz-1)=zzz
0

...so... have we tricked it to store (2^59)-1 exactly?
Nevertheless:

   factors zzz
... still doesn't respond, and needs a Force Quit.
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