title: Is there special significance to 16331239353195370.0?
body: <p>Using <code>import numpy as np</code> I've noticed that </p>
  
  <pre><code>np.tan(np.pi/2)
  </code></pre>
  
  <p>gives the number in the title and not <code>np.inf</code></p>
  
  <pre><code>16331239353195370.0
  </code></pre>
  
  <p>I'm curious about this number. Is it related to some system machine precision parameter? Could I have calculated it from something? (I'm thinking along the lines of something similar to <code>sys.float_info</code>)</p>
  
  <p><strong>EDIT:</strong> The same result is indeed reproducible  in other environments such as Java, octace, matlab... The suggested dupe does not explain why, though.</p>