Valmiki Ramayana Yuddha Kanda Sarga 28 Shloka 4

एषाम् these, नव nine, पञ्चच and five, सप्तच and seven also, कोटिसहस्राणि thousand crores, तथा so also, शङ्खुसहस्राणि thousands of Sankhas, तथा similarly, बृन्दशतानिच hundred Vrindas. (A Sankha is equal to lakh of crores, A vrinda is equal to a lakh of Maha Sankhus).

"These Vanaras are nine, five and seven thousand crores in number. They are in many thousands of Sankhas and Vrindas."