Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sexāgĭes or sexāgĭens (collat. form sexāgēsĭes, Mart. Cap. 6, § 610), num. adv. [id.], sixty times: sestertium sexagies, i. e. sixty times a hundred thousand, six millions of sesterces (v. sestertius), Caes. B. C. 1, 23; Cic. Phil. 2, 18, 45; and, in the same sense, simply sexagies, id. Rosc. Am. 2, 6.