258

Number
$258$ (two hundred and fifty-eight) is:


 * $2 \times 3 \times 43$


 * The $26$th sphenic number after $30$, $42$, $66$, $70$, $\ldots$, $182$, $186$, $190$, $195$, $222$, $230$, $231$, $246$, $255$:
 * $258 = 2 \times 3 \times 43$


 * The $41$st nontotient:
 * $\nexists m \in \Z_{>0}: \phi \left({m}\right) = 258$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function