66 (number)
66 (sixty-six) is the natural number following 65 and preceding 67. Usages of this number include: In mathematics 66 is: a sphenic number. a triangular number. a hexagonal number. a semi-meandric number. a semiperfect number, being a multiple of a perfect number. 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. palindromic and a repdigit in bases 10 (6610), 21 (3321) and 32 (2232) In science Astronomy Messier object Spiral Galaxy M66, a magnitude 10.0 galaxy in the constellation Leo. The New General Catalogue object 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 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