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There are no books called "letters" (or epistles) in the Hebrew Old Testament. All books that are designated as "letters" are Greek, and found in the New Testament.
The 6 books of the New Testament that are not letters include: Matthew, Mark, Luke, John, Acts, and Revelation.
There are books in the Old Testament, letters are in the New Testament.
Nobody is going to count the number of letters in a Harry Potter books. There are thousands of words never mind letters.
If by 'works' you mean writings such as books or letters, then there are 27 in all.
The Bible has a total of 3,536,489 letters. Moreover, the Bible has: 773,693 words, 31,209 verses, 1189 chapters and 66 books.
There are 14 letters or books written by Paul. 13 of the letters mention he is the writer and the other letter or book of Hebrews is widely accepted that he wrote that also.
Special types of books
Historical, letters, and prophetic books.
read the books
Many of Paul's books are letters to various churches or people. Many of these are found in the New Testament. The list includes (but not limited to): Romans, 1/2 Corinthians, Galatians, Ephesians, Philippians, Colossians, 1/2 Thessalonians, 1/2 Timothy, Titus, Philemon, etc....