For a cylindrical conductor, the product of its resistivity and...

Resistivity is denoted by $\rho$ and conductivity is denoted by $\sigma$.

By definition, conductivity is the reciprocal of resistivity, i.e., $\sigma = \dfrac{1}{\rho}$.

The product of resistivity and conductivity is $\rho \times \sigma = \rho \times \dfrac{1}{\rho} = 1$.

Since the product is a dimensionless constant equal to $1$, it does not depend on any physical parameters such as material, cross-sectional area, or temperature.