**Fifty-three** (53, LIII) is the natural number following fifty-two and preceding fifty-four.

**Fifty-three** is the 16th smallest prime number. The next is fifty-nine. Fifty-three is also the sum of five consecutive primes (5 + 7 + 11 + 13 + 17).

**Fifty-three** is also:

- The atomic number of iodine.
- The code for international direct dial phone calls to Cuba.
- In the title of the 1912 movie
*North of Fifty Three*, remade in 1917. - The number of short poems in the book
*Rumi Birdsong*by Jelaluddin Rumi.