666

Courtesy of Wikipedia: "The Apple I was designed by Steve Wozniak originally for personal use. Wozniak's friend, Steve Jobs, had the idea of selling the computer. It was sold as Apple's first product, beginning in April 1976. It was originally planned to sell for US$777.77, but Jobs saw this price as too steep and had it lowered to $666.66 just before its release. About 200 units were produced."