The Race of Sages - Verse 46-48

His span of life as reckoned by Brahmanas, experts in calculation, extended to five crores and sixtyone lakhs of years. For sixty lakhs of years3 , this Ravana made Devas and Sages terribly sleepless (by means of his atrocities). In the twenty-fourth Tretayuga, when his merit of penance declined, he met Rama, the son of Dasaratha, ( in battle) and was slain along with his followers.