Although it appears that the Bible (also known as the Holy Scriptures) appears to speak about itself in verses such as 2 Timothy 3:15-17 and Hebrews 4:12, there are deep problems with the conclusion...
The longest verse in the Bible is Esther 8:9. The average number of words contained in the verse is around 70-90, depending on the translation.
The longest verse in the Tanach is Lev. 13:33...
It isn't. The word 'Bible' means 'book' and comes from the Greek 'Biblos'. When the Bible was written it was made of individual books - or rather scrolls - that were hand written and copied and used...