Euler Phi Function of 166

Example of Euler Phi Function of 2 times Odd Prime

$\phi \left({166}\right) = 82$

where $\phi$ denotes the Euler $\phi$ Function.

Proof

We have that:

$166 = 2 \times 83$

Thus:

\(\ds \phi \left({166}\right)\)

\(=\)

\(\ds 83 - 1\)

Euler Phi Function of 2 times Odd Prime

\(\ds \)

\(=\)

\(\ds 82\)

$\blacksquare$