5 is Mary’s number; Mary is herself and also a symbol for the church (Gen 3:15, Rev 12:4-5). 6 is Satan’s number. 77 is Jesus’ number. 777 is the Trinity. In 5677, we have Satan standing between Mary/Church and Jesus. In 5777, we have Mary/Church and the Trinity triumphant.
Background reading and other sources:
“Mary and the Number Five”
About why the number 5 is a symbol for the Blessed Virgin Mary.
- May apparition @ https://www.ewtn.com/fatima/apparitions/May.htm
- June apparition @ https://www.ewtn.com/fatima/apparitions/June.htm
- July apparition @ https://www.ewtn.com/fatima/apparitions/July.htm
- August arrest and apparition @ https://www.ewtn.com/fatima/apparitions/august.htm
- September apparition @ https://www.ewtn.com/fatima/apparitions/september.htm
- Explanation of Queen of Heaven @ http://www.ewtn.com/expert/answers/mother.htm