166

Number
$166$ (one hundred and sixty-six) is:


 * $2 \times 83$


 * The $2$nd of the $2$nd ordered triple of consecutive integers after $\left({105, 106, 107}\right)$ that have Euler $\phi$ values which are strictly increasing:
 * $\phi \left({165}\right) = 80$, $\phi \left({166}\right) = 82$, $\phi \left({167}\right) = 166$


 * The $8$th Smith number after $4$, $22$, $27$, $58$, $85$, $94$, $121$:
 * $1 + 6 + 6 = 2 + 8 + 3 = 13$


 * The $12$th integer $m$ such that $m! - 1$ (its factorial minus $1$) is prime:
 * $3$, $4$, $6$, $7$, $12$, $14$, $30$, $32$, $33$, $38$, $94$, $166$