66 (number)

66 (sixty-six) is the natural number following 65 and preceding 67.

Usages of this number include:

In mathematics

66 is:

• the 3rd discrete tri-prime; or also termed sphenic number.^[1], and the 3rd of the form (2.3.r).
• with an
  3
  -aliquot tree.
• a triangular number.^[2]
• a hexagonal number.^[3]
• a Icositrigonal number^[4]
• a
  semi-meandric number.^[5]
• a semiperfect number, being a multiple of a perfect number.^[6]
• an Erdős–Woods number, since it is possible to find sequences of 66 consecutive integers such that each inner member shares a factor with either the first or the last member.^[7]
• palindromic and a repdigit in bases 10 (66₁₀), 21 (33₂₁) and 32 (22₃₂)

In science

Astronomy

• magnitude 10.0 galaxy in the constellation Leo
  .
• The New General Catalogue object^[8] NGC 66, a peculiar barred spiral galaxy in the constellation Cetus.
• 66 Maja, a carbonaceous background asteroid from the central regions of the asteroid belt.

Physics

• The atomic number of dysprosium, a lanthanide.

In computing

66 (more specifically 66.667) megahertz (MHz) is a common divisor for the

• The designation of the historic U.S. Route 66, dubbed the "Mother Road" by novelist John Steinbeck, and other roads.
• Phillips 66, a brand of gasoline and service station in the United States.

In religion

• The total number of chapters in the Bible Book of Isaiah.
• The number of verses in Chapter 3 of the Book of Lamentations in the Old Testament.
• The total number of books in the Protestant edition of the Bible (Old Testament and New Testament) combined.^{[citation needed]}
• In
  The Name Of Allah (الله)
  numeric value is 66.

In sports

• The number of the laps of the Spanish Grand Prix.
• The longest field goal made in NFL history was 66 yards and kicked by Justin Tucker.

In entertainment

Cinema

• bar mitzvah in London on the day of the 1966 World Cup final
  .
• In the
  clone troopers to kill the Jedi
  commanding them.