Yes 16. However, according to international standards, it is between 13 digits and 19 digits, and the number of card numbers in each region will be different, depending on the actual number of card numbers of relevant credit cards applied for. The card number 16 is the current international standard, and the first 6 digits of 16 are the BIN code, that is, the issuer identification code; The 7th to15th digits are bank accounts, which are usually freely distributed according to regional affiliation; 16 is a check bit, which is used to verify the validity of the card number.