Interpretation of p value - 4.65 e-13 I haven't come across a p-value with a letter before how is this interpreted?

This is a common way to express scientific notation.
$$
A e B = A \times 10^{B} 
$$
We do this to save space. If your case, it would be possible to write the number as $0.000000000000465$, but that is a lot of writing, and it’s easy for our eyes to glaze over all of the digits. At a glance, can you tell if that number is bigger or smaller than $0.00000000000465?$
However, you can tell, easily, that $4.65\times 10^{-12}>4.65\times 10^{-13}$.
We can use positive numbers in the exponent to represent large numbers, too. For example, $6.022\times 10^{23}$ is an important number in chemistry, and chemists don’t want to write $602200000000000000000000$.
