164

Number
$164$ (one hundred and sixty-four) is:


 * $2^2 \times 41$


 * The $5$th positive integer solution after $1, 3, 15, 104$ to $\phi \left({n}\right) = \phi \left({n + 1}\right)$:
 * $\phi \left({164}\right) = 80 = \phi \left({165}\right)$