You can do this by taking the 9-digit complement of the number 100000, adding it to the number 164502423, removing the leftmost digit from the result, and adding it to the number: 164502423
-100000 take the complement and add it: 164502423 +999899999 = 1164402422 remove the leftmost digit and add it to the rightmost one: 164402422 + 1 = 164402423 and there you have it.
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