556

Number
$556$ (five hundred and fifty-six) is:
 * $2^2 \times 139$


 * The $45$th untouchable number after $2$, $5$, $52$, $88$, $96$, $120$, $124$, $\ldots$, $406$, $408$, $426$, $430$, $448$, $472$, $474$, $498$, $516$, $518$, $520$, $530$, $540$, $552$