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.