668867 has 2 divisors, whose sum is σ = 668868. Its totient is φ = 668866.

The previous prime is 668851. The next prime is 668869. The reversal of 668867 is 768866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668867 - 2⁴ = 668851 is a prime.

Together with 668869, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668867.

It is not a weakly prime, because it can be changed into another prime (668869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334433 + 334434.

It is an arithmetic number, because the mean of its divisors is an integer number (334434).

2⁶⁶⁸⁸⁶⁷ is an apocalyptic number.

668867 is a deficient number, since it is larger than the sum of its proper divisors (1).

668867 is an equidigital number, since it uses as much as digits as its factorization.

668867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 668867 is about 817.8428944486. The cubic root of 668867 is about 87.4540493426.

Subtracting 668867 from its reverse (768866), we obtain a palindrome (99999).

The spelling of 668867 in words is "six hundred sixty-eight thousand, eight hundred sixty-seven".