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Visa/MC/Discover cards have 16. American Express cards have 15.
E stands for energy, M for mass, and C squared for the speed of light squared.
The number of digits on a credit card varies by the issuer, however, ISO standards for credit cards call for 15 or 16. Visa, Mastercard and Discover cards have 16 digits. American Express cards have 15 digits.
The correct formula is E = MC².
E=mc squared