166568641 has 2 divisors, whose sum is σ = 166568642. Its totient is φ = 166568640.

The previous prime is 166568593. The next prime is 166568681. The reversal of 166568641 is 146865661.

166568641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122744241 + 43824400 = 11079^2 + 6620^2 .

It is a cyclic number.

It is not a de Polignac number, because 166568641 - 2⁷ = 166568513 is a prime.

It is a super-2 number, since 2×166568641² = 55490224329173762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166568681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83284320 + 83284321.

It is an arithmetic number, because the mean of its divisors is an integer number (83284321).

Almost surely, 2^166568641 is an apocalyptic number.

It is an amenable number.

166568641 is a deficient number, since it is larger than the sum of its proper divisors (1).

166568641 is an equidigital number, since it uses as much as digits as its factorization.

166568641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 166568641 is about 12906.1474112145. The cubic root of 166568641 is about 550.2132957834.

The spelling of 166568641 in words is "one hundred sixty-six million, five hundred sixty-eight thousand, six hundred forty-one".