166845893 has 2 divisors, whose sum is σ = 166845894. Its totient is φ = 166845892.

The previous prime is 166845881. The next prime is 166845983. The reversal of 166845893 is 398548661.

Together with next prime (166845983) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157803844 + 9042049 = 12562^2 + 3007^2 .

It is a cyclic number.

It is not a de Polignac number, because 166845893 - 2⁶ = 166845829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166845823) 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, 83422946 + 83422947.

It is an arithmetic number, because the mean of its divisors is an integer number (83422947).

Almost surely, 2^166845893 is an apocalyptic number.

It is an amenable number.

166845893 is a deficient number, since it is larger than the sum of its proper divisors (1).

166845893 is an equidigital number, since it uses as much as digits as its factorization.

166845893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 50.

The square root of 166845893 is about 12916.8840282786. The cubic root of 166845893 is about 550.5184015861.

The spelling of 166845893 in words is "one hundred sixty-six million, eight hundred forty-five thousand, eight hundred ninety-three".