668089 has 2 divisors, whose sum is σ = 668090. Its totient is φ = 668088.

The previous prime is 668069. The next prime is 668093. The reversal of 668089 is 980866.

668089 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., 478864 + 189225 = 692^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 668089 - 2⁹ = 667577 is a prime.

668089 is a lucky number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (668009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334044 + 334045.

It is an arithmetic number, because the mean of its divisors is an integer number (334045).

2⁶⁶⁸⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

668089 is a deficient number, since it is larger than the sum of its proper divisors (1).

668089 is an equidigital number, since it uses as much as digits as its factorization.

668089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 668089 is about 817.3671145819. The cubic root of 668089 is about 87.4201284746.

The spelling of 668089 in words is "six hundred sixty-eight thousand, eighty-nine".