A positive integer $N$ is stealthy, if there exist positive integers $a$, $b$, $c$, $d$ such that $ab=cd=N$ and $a+b=c+d+1$.
For example, $36=4\times 9=6\times 6$ is stealthy.

You are also given that there are 2851 stealthy numbers not exceeding ${10}^6$.

How many stealthy numbers are there that don't exceed ${10}^{14}$?