You must report the amount of you winnings.
you may deduct your gambling losses - up to the amount you won - $13,300. You would need to take this deduction on your schedule A and should itemize to take such deduction. And you would need a proof of all your losses.
To get better benefits from itemized - you may add any mortgage interest, real estate and property tax, charitable contributions, etc.
I do not think that this income will affect your SS benefits, as this is not earned income.
Please let me know if any clarification needed.