66 (number)

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

← 65 66 67 →
← 60 61 62 63 64 65 66 67 68 69 → List of numbers Integers ← 0 10 20 30 40 50 60 70 80 90 →
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

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

• The designation of the historic U.S. Route 66, dubbed the "Mother Road" by novelist John Steinbeck, and other roads.