This is the 9722nd most frequent Russian word.
шестерых
"Шестерых" is the form of the numeral "six" used in reference to six people in the accusative or genitive case.
The word 'шестерых' is used to indicate a quantity of six individuals or items in the accusative case of plural form.
Я видел шестерых детей в парке.
I saw six children in the park.
Here 'шестерых' refers to six people receiving an action, and it's in the accusative case addressing a plural direct object.
Учитель похвалил шестерых учеников за работу.
The teacher praised six students for their work.
In this sentence, 'шестерых' is used in the genitive case to indicate possession or association with a numerically defined group.