How many numbers does a visa card have?

Fraunt Raiz October 30, 2015
Number A is my credit card number. The 4 groups don't have a meaning. They do, actually. First digit is 4 for VISA, 5 for Mastercard, 6 for Discover/Diners Club, 3 for American Express/Diners Club (those are shorter than 16).
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Good day precious one, We love you more than anything.