256
Each "place holder" if you will, may contain 4 numbers. So it is 4x4x4x4
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With 123 digits you can make 123 one-digit numbers.
Not sure what a "didget" is. It is possible to make 18 5-digit numbers.
24
There are no three didgit numbers but there are 63 three digit numbers.
24 = 4*3*2*1