666957 has 8 divisors (see below), whose sum is σ = 936160. Its totient is φ = 421200.

The previous prime is 666937. The next prime is 666959. The reversal of 666957 is 759666.

It is a happy number.

666957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 666957 - 2⁷ = 666829 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 (666959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5794 + ... + 5907.

It is an arithmetic number, because the mean of its divisors is an integer number (117020).

2⁶⁶⁶⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

666957 is a deficient number, since it is larger than the sum of its proper divisors (269203).

666957 is a wasteful number, since it uses less digits than its factorization.

666957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11723.

The product of its digits is 68040, while the sum is 39.

The square root of 666957 is about 816.6743537053. The cubic root of 666957 is about 87.3707261096.

The spelling of 666957 in words is "six hundred sixty-six thousand, nine hundred fifty-seven".