668111 has 2 divisors, whose sum is σ = 668112. Its totient is φ = 668110.

The previous prime is 668093. The next prime is 668141. The reversal of 668111 is 111866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668111 - 2⁶ = 668047 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 (668141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334055 + 334056.

It is an arithmetic number, because the mean of its divisors is an integer number (334056).

2⁶⁶⁸¹¹¹ is an apocalyptic number.

668111 is a deficient number, since it is larger than the sum of its proper divisors (1).

668111 is an equidigital number, since it uses as much as digits as its factorization.

668111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 668111 is about 817.3805723162. The cubic root of 668111 is about 87.4210880382.

Adding to 668111 its reverse (111866), we get a palindrome (779977).

The spelling of 668111 in words is "six hundred sixty-eight thousand, one hundred eleven".