What is the potential due to a point charge q at the origin and how can it be expressed mathematically?

The potential due to a point charge q at the origin is the amount of work needed to bring a unit positive charge from infinity to that point. Mathematically, it can be expressed as V kq/r, where V is the potential, k is the Coulomb constant, q is the charge, and r is the distance from the charge to the point where the potential is being calculated.