2665

Number
$2665$ (two thousand, six hundred and sixty-five) is:


 * $5 \times 13 \times 41$


 * The $12$th Fermat pseudoprime to base $3$ after $91$, $121$, $286$, $671$, $703$, $949$, $1105$, $1541$, $1729$, $1891$, $2465$:
 * $3^{2665} \equiv 3 \pmod {2665}$


 * The $1$st term of the $4$th triplet of consecutive positive integers all of which are sphenic:
 * $2665 = 5 \times 13 \times 41$, $2666 = 2 \times 31 \times 43$, $2667 = 3 \times 7 \times 127$