The number 777 is the Biblical reference for the last day of creation. It is also a reference to the genealogy of Jesus, the Son of God.
The number seven is thought to be God's number. It represents both completion and perfection. It appears hundreds of times in the Bible. In reference to Jesus, the number 777 stands for the seven days of creation; the seven, or completion, of the change of the six natures of man that Jesus completed; and the seven, or completion, of the cause-and-effect chain of events that led to the changes Jesus brought to man.