On the bicanonical maps of primitive varieties with $q(X) = dim(X)$: the   degree and the Euler number
  In this note we studied the primitive varieties of general type with $q(X) = dim(X)$ and non-birational bicanonical maps. Let $X$ be such a variety. We bounded the degree of its bicanonical map. If moreover the Albanese variety $Alb(X)$ is simple, we proved that the Euler number $\chi(\omega_X) = 1$, and $|2K_X|$ separates the points mapped to the same general point via the Albanese map. 
Lei Zhang
math.AG