362,880
edit:
3,628,800
edit:
Sorry, Whizkid. You included '10', whereas the question
clearly stated "single-digit numbers".
Now that we think about it, the "10 single digit numbers"
must include zero, so the product is zero.
But for the digits 1 thru 9, the product is still 362,880 .
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6 x 10^10
5 x 10^-9
Technically, that is not possible. A digit is another word for a number and it would be impossible for a single number to contain ten numbers.
A single digit prime number
"Single digit numbers".