1669

Number
$1669$ (one thousand, six hundred and sixty-nine) is:


 * The $263$rd prime number


 * The $8$th after $199$, $409$, $619$, $829$, $1039$, $1249$, $1459$ of the smallest $10$ primes in arithmetic sequence:
 * $1669 = 7 \times 210 + 199$


 * The $2$nd of the $53$rd pair of twin primes:
 * $1669 - 1667 = 2$