The characteristic of number ${\log }_{10}{\log }_2{\log }_3{\log }_{3}19683$ is

${\log }_{10}{\log }_2{\log }_3{\log }_{3}19683$

$={\log }_{10}{\log }_2{\log }_3{\log }_3{3}^9$

$={\log }_{10}{\log }_2{\log }_{3}9{\log }_{3}3$

$={\log }_{10}{\log }_2{\log }_3{3}^2$

$={\log }_{10}{\log }_{2}2$

$\Rightarrow {\log }_{10}1=0$

Characteristic is ‘0’.