As of April 2018, how many dictatorships are there in the world?

According to the Encyclopedia of Britannica, "dictatorship is a form of government in which one person or a small group possesses absolute power without effective constitutional limitation... Dictators usually resort to force or fraud to gain despotic political power, which they maintain through the use of intimidation, terror, and the suppression of basic civil rights. They may employ techniques of mass propaganda in order to sustain their public support".

The Freedom House Analysis 2018 gives the following list of the 49 not-free countries under the rule of dictators: Afghanistan, Angola, Azerbaijan, Bahrain, Belarus, Brunei, Burundi, Cameroon, Central African Republic, Chad, China, The Republic of Congo, Cuba, Djibouti, Egypt, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Gambia, Iran, Iraq, Kazakhstan, Laos, Libya, Mauritania, Myanmar, North Korea, Oman, Congo (Brazzaville), South Sudan, Cambodia, Qatar, Russia, Rwanda, Saudi Arabia, Somalia, The Sudan, Swaziland, Syria, Tadjikistan, Thailand, Turkmenistan, United Arab Emirates, Uzbekistan, Venezuela, Vietnam, Yemen, Zimbabwe.