On some products taken over the prime numbers

This paper is devoted to study some expressions of the type ${\prod }_p{p}^{\lfloor \frac{x}{f(p)}\rfloor }$, where $x$ is a nonnegative real number, $f$ is an arithmetic function satisfying some conditions, and the product is over the primes $p$. We begin by proving that such expressions can be expressed by using the $\mathrm{l}\mathrm{c}\mathrm{m}$ function, without any reference to prime numbers; we illustrate this result with several examples. The rest of the paper is devoted to study the two particular cases related to $f(m)=m$ and $f(m)=m-1$. In both cases, we found arithmetic properties and analytic estimates for the underlying expressions. We also put forward an important conjecture for the case $f(m)=m-1$, which depends on the counting of the prime numbers of a special form.