A statement from his publicist Kirt Webster said he died Friday after a short illness.
Williams had 17 No. 1 hits before retiring in 2016. His mellow sound influenced a later generation of singers including Joe Nichols and Josh Turner and Keith Urban has said Williams drew him to country music.
Williams, nicknamed "the Gentle Giant," had a rich voice, gentle delivery and storytelling style. He toured sparingly, did few media interviews and spent much of his time on his farm west of Nashville.
His hits included "I Believe in You," ''Lord, I Hope This Day Is Good," ''You're My Best Friend," ''Some Broken Hearts Never Mend," ''Till the Rivers All Run Dry" and "Back in My Younger Days." At least one duet with Emmylou Harris made the charts, "If I Needed You" in 1981.
Edited from CBS News