66 (number)

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← 65 66 67 →
Cardinal sixty-six
Ordinal 66th
(sixty-sixth)
Factorization 2 × 3 × 11
Divisors 1, 2, 3, 6, 11, 22, 33, 66
Greek numeral ΞϚ´
Roman numeral LXVI, lxvi
Binary 10000102
Ternary 21103
Senary 1506
Octal 1028
Duodecimal 5612
Hexadecimal 4216

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

Contents

In mathematics

66 is a sphenic number, a semiperfect number, [1] and a Erdős–Woods number. [2] It is also the 11th triangular number [3] and the 6th hexagonal number [4] .

In computing

66 (more specifically 66.667) megahertz (MHz) is a common divisor for the front side bus (FSB) speed, overall central processing unit (CPU) speed, and base bus speed. On a Core 2 CPU, and a Core 2 motherboard, the FSB is 1066 MHz (~16 × 66 MHz), the memory speed is usually 666.67 MHz (~10 × 66 MHz), and the processor speed ranges from 1.86 gigahertz (GHz) (~66 MHz × 28) to 2.93 GHz (~66 MHz × 44), in 266 MHz (~66 MHz × 4) increments.

In motor vehicle transportation

Route 66 sign Route66 sign.jpg
Route 66 sign

References

  1. ↑ Sloane, N. J. A. (ed.). "SequenceA007304(Sphenic numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  2. ↑ Sloane, N. J. A. (ed.). "SequenceA059756(Erdős-Woods numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  3. ↑ Sloane, N. J. A. (ed.). "SequenceA000217(Triangular numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  4. ↑ Sloane, N. J. A. (ed.). "SequenceA000384(Hexagonal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.


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