It has changed:
Per wiki:
These definitions meant that the value of the Avogadro number depended on the experimentally determined value of the mass (in grams) of one atom of those elements, and therefore it was known only to a limited number of decimal digits. However, in its 26th Conference, the BIPM adopted a different approach: effective 20 May 2019, it defined the Avogadro number as the exact value N = 6.02214076×1023, and redefined the mole as the amount of a substance under consideration that contains N constituent particles of the substance. Under the new definition, the mass of one mole of any substance (including hydrogen, carbon-12, and oxygen-16) is N times the average mass of one of its constituent particles—a physical quantity whose precise value has to be determined experimentally for each substance.
Well, I was close. I had the correct power of 10.
Thanks for looking it up.
I made up this joke in high school chemistry class. I almost got thrown out of that class for later telling a dirty joke.
Q: Why did Avogadro die?
A: His number was up.
Q: Why can’t you call Avogadro?
A: He switched to an unlisted number.