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The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987
Alien registration number should be 9 digits long with no alphabetical characters.
An employee number can vary in length, depending on the company. Some employee numbers might be 10 digits long, while others may only be 5 digits long.
16 digits
Tens of quintillions.