More than 17 million copies of the Holy Quran and also book shelves and carpets in the mosques were also sterilized, it added, Youm7.com website reported.
It said the moves are aimed at preventing the spread of COVID-19 in the country.
Saudi Arabia has registered 1,885 coronavirus infections so far. It has also reported 21 deaths from the disease.
On March 20, the kingdom suspended the holding of daily prayers and the weekly Friday prayers inside and outside the walls of the two mosques in Mecca and Medina to limit the spread of coronavirus.
Earlier, it had suspended congregational prayers in other mosques in the country except Masjid al-Haram and Masjid an-Nabawi, in Mecca and Medina respectively.