From Wiktionary, the free dictionary
Derived from Sanskrit चतुष्षष्टि (catuṣṣaṣṭi).
చౌషష్టి (cauṣaṣṭi)
- four and sixty; sixty four
- Budaraju Radhakrishna (1971) “చౌషష్టి”, in Early Telugu Inscriptions (up to 1100 A.D.) with Texts, Glossary & Brief Linguistic History., Kalabhavan, Saifabad, Hyderabad: Andhra Pradesh Sahitya Akademi, page 323.