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Note: the user who created this article did not come up with the number from the riddle: "What is special about the number 8,549,176,320?"

8,549,176,320 not only contains every decimal (base 10) digit (0-9), but all the digits are placed in alphabetical order.

(8 = eight, 5 = five, 4 = four, 9 = nine, 1 = one, 7 = seven, 6 = six, 3 = three, 2 = two and 0 = zero.