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Why do You want a most used credit card number...people will probably NEVER give you a most use credit card number, sorry :\
Depends on the type of credit card. For most, the number is a 16-digit number, 4 numbers followed by a space and so on. Some, however, are different.
16 digits in a credit card number. Most cases it is three.
The number 0.
Most credit cards I know of have a 16-digit number. It will often be divided into groups of 4 on the card, but this is mostly for readability. I hope this question isn't an attempt to get someone to provide you with a valid credit card number.