Back Ҳ. ҟ. 668 Abkhazian 668 ق م Arabic 668 ق م ARZ 668 e.C. AST 668 г. пр.н.е. Bulgarian 668 v. Chr. German 668 BC English -668 Esperanto ۶۶۸ (پیش از میلاد) Persian 668 f.Kr. Frisian
| Blianta RC: 671 RC 670 RC 669 RC - 668 RC - 667 RC 666 RC 665 RC | |
| deichniúra: 690idí RC 680idí RC 670idí RC - 660idí RC - 650idí RC 640idí RC 630idí RC | |
| Aois: 8ú haois RC - 7ú haois RC - 6ú haois RC | |