555 (number)

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

Mathematical properties

It is a sphenic number.

In base 10, it is a repdigit, and because it is divisible by the sum of its digits, it is a Harshad number. It is also a Harshad number in binary, base 11, base 13 and hexadecimal.

Electronics

• 555 timer IC, a classic integrated circuit chip that has numerous timer and multivibrator applications, and historically widely used in electronics

Other fields

Five hundred [and] fifty five is:

• The years AD 555 and 555 BC.
• The telephone exchange for fictitious phone numbers in US movies and video games—see 555 (telephone number) and North American Numbering Plan.
• The number of keyboard sonatas written by Domenico Scarlatti, according to the catalog by Ralph Kirkpatrick.
• A musical piece by Frank Zappa (Five-Five-FIVE). It refers to the time signature of the composition (5/8 - 5/8 - 5/4).
• The Thai version of lol in a text conversation. "5" in Thai is pronounced "ha", so three of them would be "hahaha." Also used by gamers.
• "5" in Mandarin Chinese is pronounced "wu" so three together would be "wuwuwu", which sounds somewhat like sobbing.
• The approximate height of the Washington Monument in feet.
• Adolf Hitler's membership number in the Deutsche Arbeiterpartei (DAP). He was the 55th member; the founders began the register with number 501, to make it appear that there were many more people in the party ranks than actually were members.
• The Greek gematrical equivalent to the word Necronomicon, according to Simon.
• Kamen Rider 555, a Japanese tokusatsu TV series, where "555" is read as "Φ's", "Phi's", or "Faiz".
• A common abbreviation of State Express 555, a cigarette brand owned by British American Tobacco.
  • State Express 555's sponsorship of motorsport lent the number as branding livery to racecars in Formula One and the World Rally Championship.
• 5:55 (pronounced in English "five fifty-five") is the second album by French musician and actress Charlotte Gainsbourg. "5:55" is also the first song on this album.
• Padova Rugby 555 ASD is an Italian non-professional rugby union team.
• The band Phish has a song called '555' on their album Fuego.

See also

• 500 (disambiguation)

External links

Wikimedia Commons has media related to 555 (number).

• 555-LIST list of fictional phone numbers
• Explanation of the song 'Heretic Anthem' by Slipknot which features 555 in the lyrics