57 is the natural number following 56 and preceding 58.

In mathematics

57 is a 20-gonal number.

In science

• The atomic number of lanthanum, the first of the lanthanides

In astronomy,

Messier object M57, a magnitude 9.5 planetary nebula in the constellation Lyra, also known as the Ring Nebula

The New General Catalogue object (http://www.ngcic.org/) NGC 57, an elliptical galaxy in the constellation Pisces

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) of the solar eclipse series which began on -1161 June 17 and ended on 137 August 4. The duration of Saros series 57 was 1298.1 years, and it contained 73 solar eclipses.

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -823 April 16 and ended on 475 June 5. The duration of Saros series 57 was 1298.1 years, and it contained 73 lunar eclipses.

In other Fields

Fifty-seven is also:

• The code for international direct dial phone calls to Colombia.
• The number of varieties used by Heinz as a marketing slogan and commonly found on their ketchup bottles [1] (http://www.heinz.com/jsp/consumer_faq.jsp#Miscellaneous%20Questions%20about%20H.J.%20Heinz%20Company).
• The designation of Interstate 57, a freeway that runs from Missouri to Illinois.
• In the title of the movie Passenger 57, starring Wesley Snipes.
• The year AD 57, 57 BC, or 1957.
• *Sexual slang for anal sex.