999999999999999999999 + 9 = 1000000000000000000008.
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7.777777778x1073
That means to multiply the number with itself, using it 3 times as a factor. In this case: 999999999999999999999 x 999999999999999999999 x 999999999999999999999
That is 27 x 9 = 243
189
The sum of 27 occurrences of the number 9 is calculated by multiplying 27 by 9, resulting in 243.