Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 7
Sanskrit:
षष्टिंवर्षसहस्राणि षष्टिंवर्षशतानि च ।नालर्कादपरो राजन् बुभुजे मेदिनीं युवा ॥ ७ ॥
ITRANS:
ṣaṣṭiṁ varṣa-sahasrāṇiṣaṣṭiṁ varṣa-śatāni canālarkād aparo rājanbubhuje medinīṁ yuvā
Translation:
Alarka, the son of Dyumān, reigned over the earth for sixty-six thousand years, my dear King Parīkṣit. No one other than him has reigned over the earth for so long as a young man.