  We derive the geometric albedo of a near-Earth asteroid, (4179) Toutatis, to
investigate its surface physical conditions. The asteroid has been studied
rigorously not only via ground-based photometric, spectrometric, polarimetric,
and radar observations but also via \textit{in situ} observation by the Chinese
Chang'e-2 space probe; however, its geometric albedo is not well understood. We
conducted V-band photometric observations when the asteroid was at opposition
in April 2018 using the three telescopes in the southern hemisphere that
compose the Korea Microlensing Telescope Network (KMTNet). The observed
time-variable cross section was corrected using the radar shape model. We find
that Toutatis has a geometric albedo $p_\mathrm{V} = 0.185^{+0.045}_{-0.039} $,
which is typical of S-type asteroids. We compare the geometric albedo with
archival polarimetric data and further find that the polarimetric slope--albedo
law provides a reliable estimate for the albedo of this S-type asteroid. The
thermal infrared observation also produced similar results if the size of the
asteroid is updated to match the results from Chang'e-2. We conjecture that the
surface of Toutatis is covered with grains smaller than that of the near-Sun
asteroids including (1566) Icarus and (3200) Phaethon.
