166559843 has 2 divisors, whose sum is σ = 166559844. Its totient is φ = 166559842.

The previous prime is 166559803. The next prime is 166559879. The reversal of 166559843 is 348955661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166559843 - 2⁶ = 166559779 is a prime.

It is not a weakly prime, because it can be changed into another prime (166559803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83279921 + 83279922.

It is an arithmetic number, because the mean of its divisors is an integer number (83279922).

Almost surely, 2^166559843 is an apocalyptic number.

166559843 is a deficient number, since it is larger than the sum of its proper divisors (1).

166559843 is an equidigital number, since it uses as much as digits as its factorization.

166559843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 47.

The square root of 166559843 is about 12905.8065613893. The cubic root of 166559843 is about 550.2036083620.

The spelling of 166559843 in words is "one hundred sixty-six million, five hundred fifty-nine thousand, eight hundred forty-three".