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First, the number
is divided by 18 without a remainder.
(Apply the division rules for division by 2 and for division by 9).
Next, the quotient (the integer number)
has the "ones" digit 7 and the remaining 34 digits all are equal to 5 (or "each is equal to 5").
Therefore, the sum under the question is 34*5 + 7 = 177.