667859 has 2 divisors, whose sum is σ = 667860. Its totient is φ = 667858.

The previous prime is 667837. The next prime is 667861. The reversal of 667859 is 958766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667859 - 2¹² = 663763 is a prime.

Together with 667861, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (667819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333929 + 333930.

It is an arithmetic number, because the mean of its divisors is an integer number (333930).

2⁶⁶⁷⁸⁵⁹ is an apocalyptic number.

667859 is a deficient number, since it is larger than the sum of its proper divisors (1).

667859 is an equidigital number, since it uses as much as digits as its factorization.

667859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 667859 is about 817.2264068176. The cubic root of 667859 is about 87.4100954115.

The spelling of 667859 in words is "six hundred sixty-seven thousand, eight hundred fifty-nine".