516

Number
$516$ (five hundred and sixteen) is:


 * $2^2 \times 3 \times 43$


 * The $39$th untouchable number after $2$, $5$, $52$, $88$, $96$, $120$, $124$, $\ldots$, $324$, $326$, $336$, $342$, $372$, $406$, $408$, $426$, $430$, $448$, $472$, $474$, $498$


 * The $10$th even integer after $2$, $4$, $94$, $96$, $98$, $400$, $402$, $404$, $514$ that cannot be expressed as the sum of $2$ prime numbers which are each one of a pair of twin primes