CAIRO, Aug 21 (Reuters) - Egypt sold 659.9 million euros ($777.56 million) in one-year treasury bills on Monday, the central bank said.

The average yield on the euro-denominated bills, which mature on August 21, 2018, is 1.797 percent.

The sale received 734.9 million euros in offers, the central bank said. ($1 = 0.8487 euros)

(Reporting by Eric Knecht and Arwa Gaballa; Editing by Robin Pomeroy) ((eric.knecht@thomsonreuters.com; +20 2 2394 8102; Reuters Messaging: eric.knecht.thomsonreuters.com@reuters.net))