158

Number
$158$ (one hundred and fifty-eight) is:
 * $2 \times 79$


 * The $22$nd nontotient:
 * $\nexists m \in \Z_{>0}: \phi \left({m}\right) = 158$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function


 * One of the prime factors of one of the terms of one of the $2$ representations of $635 \, 318 \, 657$ as the sum of $2$ fourth powers:
 * $635,318,657 = 59^4 + 158^4$

Also see