Long/Int in scala to hex string
<p>With <code>Integer.toString(1234567, 16).toUpperCase() // output: 12D68</code> could help to convert an <code>Int</code> to Hex string.</p>

<p>How to do the same with Long?</p>

<p><code>Long.toString(13690566117625, 16).toUpperCase() // but this will report error</code></p>