6668999101
This number is a prime.
 The largest invertible prime with the least length,
consisting of all the invertible digits and containing the
beast number, so that its inverted prime also contains the
beast number.  [Loungrides]
 
The largest invertible prime with the least length,
consisting of all the invertible digits and containing the
beast number, so that its inverted prime also contains the
beast number.  [Loungrides]
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