How do credit card companies not run out of numbers?
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With 16 numbers, that gives them some 10 quadrillion numbers to work with. Even if they decide to remove some gimmicky ones like 00000…, that leaves them with plenty of numbers to go around.
And if that starts to become a problem in the year 2400 when mankind is populating the stars, they can always just add another digit to the next batch.
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