Google says my IP address is something like this (I've changed it just in case there is anything personally identifiable in it).
Your public IP address is 2602:306:78c5:6a40:421e:6813:d55:ce7f
The above number (similar to the one Google gives me) translates to this integer:
(see http://www.webdnstools.com/dnstools/ipcalc for the best IP calculator I've found.)
My actual IP address, found at http://www.whatismyip.com, is something like this (again I've changed it a bit):
Which is this integer:
The Google IPv6 address isn't even in the IPv4 range. And why would Google say that is my address while WhatIsMyIP shows the seemingly correct IP?