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We present a comprehensive multiwavelength analysis of the bright, longduration gamma-ray burst GRB 070125, comprised of observations in $\gamma$-ray,X-ray, optical, millimeter and centimeter wavebands. Simultaneous fits to theoptical and X-ray light curves favor a break on day 3.78, which we interpret asthe jet break from a collimated outflow. Independent fits to optical and X-raybands give similar results in the optical bands but shift the jet break toaround day 10 in the X-ray light curve. We show that for the physicalparameters derived for GRB 070125, inverse Compton scattering effects areimportant throughout the afterglow evolution. While inverse Compton scatteringdoes not affect radio and optical bands, it may be a promising candidate todelay the jet break in the X-ray band. Radio light curves show rapid fluxvariations, which are interpreted as due to interstellar scintillation, and areused to derive an upper limit of $2.4 \times 10^{17}$ cm on the radius of thefireball in the lateral expansion phase of the jet. Radio light curves andspectra suggest a high synchrotron self absorption frequency indicative of theafterglow shock wave moving in a dense medium. Our broadband modeling favors aconstant density profile for the circumburst medium over a wind-like profile($R^{-2}$). However, keeping in mind the uncertainty of the parameters, it isdifficult to unambiguously distinguish between the two density profiles. Ourbroadband fits suggest that \event is a burst with high radiative efficiency($> 60 %$).

A comprehensive study of GRB 070125, a most energetic gamma ray burst