I can recommend SpeedCrunch. Free and open source, comes in an installer free (USB&#x2F;portable) version, and as for checking the value of the number in the topic, simply type hex(17281580835365214242). It supports Windows as well as OS X.<p><a href="https:&#x2F;&#x2F;bitbucket.org&#x2F;heldercorreia&#x2F;speedcrunch" rel="nofollow">https:&#x2F;&#x2F;bitbucket.org&#x2F;heldercorreia&#x2F;speedcrunch</a>