166849993 has 2 divisors, whose sum is σ = 166849994. Its totient is φ = 166849992.

The previous prime is 166849979. The next prime is 166849999. The reversal of 166849993 is 399948661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151585344 + 15264649 = 12312^2 + 3907^2 .

It is a cyclic number.

It is not a de Polignac number, because 166849993 - 2⁵ = 166849961 is a prime.

It is not a weakly prime, because it can be changed into another prime (166849999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83424996 + 83424997.

It is an arithmetic number, because the mean of its divisors is an integer number (83424997).

Almost surely, 2^166849993 is an apocalyptic number.

It is an amenable number.

166849993 is a deficient number, since it is larger than the sum of its proper divisors (1).

166849993 is an equidigital number, since it uses as much as digits as its factorization.

166849993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 55.

The square root of 166849993 is about 12917.0427343104. The cubic root of 166849993 is about 550.5229109508.

The spelling of 166849993 in words is "one hundred sixty-six million, eight hundred forty-nine thousand, nine hundred ninety-three".