Let ${\cal U}$ be a non-principal ultrafilter on $\omega$, and for each $n\in\omega$, let $p_n$ denote the $n$th prime, that is $p_0 = 2, p_1=3, \ldots$

Next we introduce the following standard equivalence relation on $\big(\prod_{n\in\omega}\mathbb{Z}/p_n\mathbb{Z}\big)$: we say $a \simeq_{\cal U} b$ for $a,b \in \big(\prod_{n\in\omega}\mathbb{Z}/p_n\mathbb{Z}\big)$ if and only if $$\{n\in\omega:a(n) = b(n)\}\in {\cal U}.$$

It is a standard exercise to prove that $K = \big(\prod_{n\in\omega}\mathbb{Z}/p_n\mathbb{Z}\big)/\simeq_{\cal U}$ is an uncountable field.

Questions.

1. Is there a surjective group homomorphism in either direction between the additive group of $K$ and the additive group of $\mathbb{R}$?
2. Same question for the multiplicative groups of $K \setminus\{0\}$ and $\mathbb{R}\setminus\{0\}$ respectively.