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The lateral distribution of muons with threshold energy e ~ 1*sec(theta) GeVhave been studied in showers with energy E>=10^17 eV. The data considered inthe analysis have been collected from November 2011 to June 2013. Experimentalvalues are compared to predictions obtained with the use of CORSIKA code withinthe framework of various hadron interaction models. The best agreement betweenexperiment and theory is observed for QGSJETII-04 model. At E~10^17 eV itcomplies to a mixed cosmic ray composition with the mean atomic number<lnA>~3.0+/-0.5. At E>= 4*10^17 eV the composition varies around the value<lnA>~0.5.

Muons in EAS with E>=10^17eV according to the data from Yakutsk array