2. As shown in the figure, $\angle A O B=\angle B O C=\angle C O D=\angle D O E=\angle E O F$, there are 15 acute angles in the figure, and the sum of these 15 acute angles is $525^{\circ}$, then $\angle A O D=$ $\qquad$ ${ }^{\circ}$.
$45$