the descendants of Adonikam: 666;

All the direct descendants of Jacob who went to Egypt with him were sixty-six in number. (This number does not include the wives of Jacob’s sons.) ¹ 

If she bears a female child, she will be impure fourteen days as during her menstrual flow, and she will remain sixty-six days in ¹  blood purity. ² 

Solomon received 666 talents ¹  of gold per year, ² 

Solomon received 666 talents ¹  of gold per year, ² 

This calls for wisdom: ¹  Let the one who has insight calculate the beast’s number, for it is man’s number, ²  and his number is 666. ³