Ramayana
शतकोटिसहस्राणि लङ्कायां किल राक्षसाः । आयुतानि च षट्त्रिंशत्सहस्राणि शतानि च ॥ ४-३५-१५
'The number of demons in Lanka is reported to be a hundred thousand crore, three lakh, ninetynine thousand and six hundred. (Note: Indian tradition has numbers up to eighteen digits. One hundred thousand crores is equal to a 'mahapadma' which has thirteen digits. The number described here is 1000000399600.) ॥ 4-35-15॥
english translation
zatakoTisahasrANi laGkAyAM kila rAkSasAH । AyutAni ca SaTtriMzatsahasrANi zatAni ca ॥ 4-35-15
hk transliteration by Sanscript