166959847 has 2 divisors, whose sum is σ = 166959848. Its totient is φ = 166959846.

The previous prime is 166959809. The next prime is 166959851. The reversal of 166959847 is 748959661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166959847 - 2⁷ = 166959719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166959857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83479923 + 83479924.

It is an arithmetic number, because the mean of its divisors is an integer number (83479924).

Almost surely, 2^166959847 is an apocalyptic number.

166959847 is a deficient number, since it is larger than the sum of its proper divisors (1).

166959847 is an equidigital number, since it uses as much as digits as its factorization.

166959847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The square root of 166959847 is about 12921.2943237123. The cubic root of 166959847 is about 550.6437058335.

It can be divided in two parts, 1669 and 59847, that added together give a palindrome (61516).

The spelling of 166959847 in words is "one hundred sixty-six million, nine hundred fifty-nine thousand, eight hundred forty-seven".