It feels more likely that he just chose $65B rather than an exchange using unsigned 16 bit integers to do accounting.
I've received a few SMSes over the pandemic that used a float for their caller ID.
Not sure why the German Federal government chose to identify itself as "+4.4786E+11" when welcoming me into the country (actually me switching my UK SIM card to no-longer-Airplane-mode) and telling me to quarantine and test.