556

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Number

$556$ (five hundred and fifty-six) is:

$2^2 \times 139$

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

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