The momentum (p) of an object is given by the product of its mass (m) and velocity (v). In this case, the mass of the neutron is $1.67 \times 10^{-27} \mathrm{kg}$ and its velocity is $6.5 \times 10^{4} \mathrm{m} / \mathrm{s}$. So, the momentum is given by:
\[ p
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