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We present results of investigation of the poorly studied X-ray pulsar SwiftJ1816.7--1613 during its transition from the type I outburst to the quiescentstate. Our studies are based on the data obtained from X-ray observatories\textit{Swift}, \textit{NuSTAR} and \textit{Chandra} alongside with the latestIR data from UKIDSS/GPS and \textit{Spitzer}/GLIMPSE surveys. The aim of thework is to determine parameters of the system: the strength of the neutron starmagnetic field and the distance to the source, which are required for theinterpretation of the source behaviour in the framework of physically motivatedmodels. No cyclotron absorption line was detected in the broad-band energyspectrum. However, the timing analysis hints at the typical for the X-raypulsars magnetic field from a few $\times 10^{11}$ to a few $\times 10^{12}$ G.We also estimated type of the IR-companion as a B0-2e star located at distanceof 7--13~kpc.

Properties of the transient X-ray pulsar Swift J1816.7--1613 and its optical companion