The 555 (number) reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

555 (number)

555 (five hundred fifty-five) is the natural number following 554 and preceding 556.

555
Cardinal	Five hundred and fifty-five
Ordinal	555th
Factorization
Roman numeral	DLV
Binary	1000101011
Hexadecimal	22B

Table of contents

1 Mathematical properties 2 Other fields 3 External link

Mathematical properties

It is a sphenic number, a palindromic number, a repdigit.

Other fields

Five hundred is:

• The telephone exchange for fictitious phone numbers in movies, see North American Numbering Plan.
• A tongue twister in German. Try saying Funf hundert funfzehn funf 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 year AD 555.

See also: five hundred

External link

• 555-LIST list of fictional phone numbers

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