66 (number)

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

In mathematics

66 is a sphenic number, a semiperfect number, and a Erdős–Woods number. It is also the 11th triangular number and the 6th hexagonal number.

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

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

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