555 (number) - Definition and Overview

555 is the natural number following 554 and preceding 556.

Mathematical properties

It is a sphenic number, a repdigit and a Harshad number.

Other fields

Five hundred and fify five is:

• The telephone exchange for fictitious phone numbers in US movies - see 5-5-5 and North American Numbering Plan.
• A tongue twister in German. Try saying Fünfhundertfünfundfünfzig three times fast.
• The number of keyboard sonatas written by Domenico Scarlatti, according to the catalog by Ralph Kirkpatrick.
• the model number of the 555 timer IC, a classic integrated circuit (chip) implementing a variety of timer and multivibrator applications, and historically widely used in electronics.
• The years AD 555 and 555 BC.

See also: five hundred

External link

• 555-LIST (http://home.earthlink.net/~mthyen) list of fictional phone numbers