666967 has 8 divisors (see below), whose sum is σ = 768512. Its totient is φ = 567000.

The previous prime is 666959. The next prime is 666979. The reversal of 666967 is 769666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666967 - 2³ = 666959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666937) 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 in 7 ways as a sum of consecutive naturals, for example, 742 + ... + 1372.

It is an arithmetic number, because the mean of its divisors is an integer number (96064).

2⁶⁶⁶⁹⁶⁷ is an apocalyptic number.

666967 is a deficient number, since it is larger than the sum of its proper divisors (101545).

666967 is a wasteful number, since it uses less digits than its factorization.

666967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789.

The product of its digits is 81648, while the sum is 40.

The square root of 666967 is about 816.6804760737. The cubic root of 666967 is about 87.3711627708.

The spelling of 666967 in words is "six hundred sixty-six thousand, nine hundred sixty-seven".