Number 66

A page of the Numeropedia - the Special Encyclopedia of Numbers

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 [Chemistry]  The atomic number of Dysprosium (Dy). An element in the Lanthanide series: Lanthanum (57) to Lutetium (71).

 

[Geology]  Historic Route 66 went, roughly 2,400 miles, through 8 states: Illinois (beginning in Grant Park on the shore of Lake Michigan, Chicago), Missouri (St. Louis), Kansas, Oklahoma (Oklahoma City), Texas (Amarillo), New Mexico (Albuquerque), Arizona (Flagstaff) and California (ending at the Santa Monica Pier, Los Angeles).

 

[Math.]  A triangular number (sum of all integers from 1 to 11): 66 = 1+2+3+4+5+6+7+8+9+10+11. The only triangular numbers whose digits are repeated are: 55, 66 and 666.

 

 [Math.]  

The 11th triangle number is

66

The 1111th triangle number is

617,716

The 111,111th triangle number is

6,172,882,716

The 11,111,111th triangle number is

61,728,399,382,716

All numbers are palindromic.

 

[Math.]  66 = 06+15+24+33+42+51+60.

 

[Math.]  66 = 43+21.

  

[Math.]  663 = 287,496 and 28+74+96 = 198 = 66×3.

 

[Math.]  8,712 = 2,178×4 and  8,712×2,178 = 18,974,736 = 664

  

[Math.]  The denominator of the Bernoulli numbers: B10 = 5/66 and B50

 

[Math.] 

(*)   8712 = 2178×4 & 8712×2178 = 18,974,736 = 43562 (= 664).

8712…8712 = 2178…2178×4 & 8712…8712×2178…2178 = 4356…43562

 

(**)   87912 = 21978×4 & 21978×87912 = 1,932,129,936  = 439562

87912…87912 = 21978…21978×4 & 21978…21978×87912…87912 = 43956…43956

 

(***)   879912 = 219978×4 & 219978×879912 = 193,561,281,936 = 4399562

879912…879912 = 219978…219978×4 &

219978…219978×879912…879912 = 439956…4399562

 

(****)   879…912 = 219…978×4 & 219…978×879…912 = 439…9562

879…912…879…912 = 219…978…219…978×4 &

            219...978...219...978×879...912...879...912 = 439...956...439...9562.

 

[Measure]  The number of feet in a chain.

1 mile = 8 furlongs = 80 chains = 5280 feet = 8000 links = 63,360 inches. Chain (or Gunter’s chain or surveyor’s chain) is a unit used in surveying.

 

[Movie]  Name of TV show/series or movie: “Buffalo ‘66”.

 

[Phone]  International telephone dialing code for Thailand.

 

[Phone]  The number to key in text messaging on telephone keypad for letter N.

 

[Phone]  The last 2 digits of an NANPA/U.S. area code cannot be the same, i.e. cannot be: 11, 22, 33, 44, 55, 66, 77, 88 or 99. (NANPA: North American Numbering Plan Administration).

 

[Sciene]

American system

British system

Number

*****

undecillion

1066

undecillion

sextillion

1036

sextillion

*****

1021

  

[Sport]  Total number of possible bowling games: 669×241 = 5,726,805,883,325,784,576.

 

[Tech.]  Name of a chain of gasoline stations in the U.S.: Phillips 66.

 

[Theology]  The number of books in the Holy Bible: 39 in the Old Testament and 27 in the New Testament.

 

[World]  The number of nations in the United Nations Conference on Disarmament, as of 2003. The chair of the Conference rotates alphabetically every year (in May) among its nations.

 

64, 66, 67, 68 & 69

[Math.]

66×64 = 4224

66×67 = 4422

66×68 = 4488

66×69 = 4554

66×74 = 4884

 

666×661 = 440,226

666×666 = 443,556

666×669 = 445,554

666×672 = 447,552

666×663 = 441,558

666×667 = 444,222

666×670 = 446,220

666×674 = 448,884

666×664 = 442,224

666×668 = 444,888

666×671 = 446,886

666×675 = 449,550

… (generalizable pattern) …

 

66.332...

[Math.] 

401/2 = 6.32…

44001/2 = 66.332…

4440001/2 = 666.3332…

444400001/2 = 6666.33332…

44444000001/2 = 66666.333332…

4444440000001/2 = 666666.3333332…

...

 

66.5

[Geology]  The Arctic Circle is at North 66o 30’ latitude line. The Arctic is sometimes defined as the area north of the Arctic Circle.  The Antarctic Circle is at South 66o 30’ latitude line.