'Sixty six' in the Bible

All the souls who came with Jacob into Egypt, who were his direct descendants, besides Jacob's sons' wives, all the souls were sixty-six.

But if she bears a female child, then she shall be unclean two weeks, as in her period; and she shall continue in the blood of purification sixty-six days.

Now the weight of gold that came to Solomon in one year was six hundred sixty-six talents of gold,

Now the weight of gold that came to Solomon in one year was six hundred and sixty-six talents of gold,

The children of Adonikam, six hundred sixty-six.

Here is wisdom. He who has understanding, let him calculate the number of the beast, for it is the number of a man. His number is six hundred sixty-six.