'Sixty six' in the Bible

All the persons who came with Jacob into Egypt, the offspring of his body, were sixty-six, without taking into account the wives of Jacob's sons.

But if she gives birth to a female child, then she will be unclean for two weeks, as when she is unwell; and she will not be completely clean for sixty-six days.

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

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

The children of Adonikam, six hundred and sixty-six.

Here is wisdom. He who has knowledge let him get the number of the beast; because it is the number of a man: and his number is Six hundred and sixty-six.