You can make quite a few dictionary recognized words from the letters in "sixteen". Some examples are tense, teens, inset, exist, exits, tins, ties, seen, sent, next, exit, and nest.
You can make at least sixteen words.
Sixteen sixteenths make a whole (1).
Sixteen hundredths.
one
4 qts
Sixteen
24 42
five hundred sixteen or five hundred and sixteen
Sixteen.
Sixteen times to do it
16 in number words = sixteen
As separate words, it is plural.We just finished sixteen hours on the job.As a compound adjective, it is singularWe just finished a sixteen-hour shift.