The number of digits in the card number is between 13 and 19 digits according to international standards.

According to the Xicai.com platform query, the number of credit card numbers is an internationally accepted standard, ranging from 13 to 19 digits. This provision is to ensure the uniqueness and security of credit card numbers. The letter at the beginning of the credit card number represents the issuing bank, followed by a sequence of numbers. Different digits represent different meanings.

In China, common credit card numbers are 16 or 18 digits in length. The 16-digit credit card number is a UnionPay standard card, and the 18-digit credit card number is an international card such as Visa or MasterCard.