6
This number is a composite.
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There are only six prime-digit primes with distinct odd digits, i.e., 3, 5, 7, 37, 53, 73. [Loungrides]
The only perfect oblong number, i.e., 6=2*3. [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
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