How many numbers does a credit card have?

on the top of a credit card how many numbers does it have or:on the top of a credit card how many numbers does it haveor:Generally 16 for the main num

on the top of a credit card how many numbers does it have

or:on the top of a credit card how many numbers does it have

or:Generally 16 for the main number, although the latter ones are a kind of checksum as opposed to the main number, plus there's a 3 figure CVV (card verification value) which has the same function.Either way, it's not very good. As a bare minimum, they should start including letters with the numbers.

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