I vote for number 66 because it's the number of books in "The Word" (the Bible), as well as the number of generations (father to son) from Adam to Jesus. It was 33 generations to David, and then ANOTHER 33 to Jesus.
Another way of looking at 66 is 39+27 -- foolishness, I suppose, but when you think 3 and 3-squared, and 3-cubed, it describes 66 for me. OK?
And all the people went "to make great mirth, because they had understood the words that were declared unto them". Neh8:12
"The foolishness of God is wiser than men; the weakness of God is stronger than men". 1Cor1:25
Dux allows: "It is the glory of God to conceal a thing: but the honour of kings is to search out the matter". Pr25:2