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Medicare Answers
Lottery winnings are generally treated as taxable income. For sizable winnings you will receive a 1099-MISC that shows your winning income and any taxes withheld.
This would not be earned income, so I do not believe it will serve as earned income which will force a reduction in your Social Security retirement benefits.
http://socialsecurityhop.com/comment/681/Earnings-limits-income-wages