2657

Number
$2657$ (two thousand, six hundred and fifty-seven) is:


 * The $384$th prime number


 * The $10$th prime $p$ such that $p \# + 1$, where $p \#$ denotes primorial (product of all primes up to $p$) of $p$, is prime:
 * $2$, $3$, $5$, $7$, $11$, $31$, $379$, $1019$, $1021$, $2657$