666937 has 2 divisors, whose sum is σ = 666938. Its totient is φ = 666936.

The previous prime is 666929. The next prime is 666959. The reversal of 666937 is 739666.

666937 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657721 + 9216 = 811^2 + 96^2 .

It is a cyclic number.

It is not a de Polignac number, because 666937 - 2³ = 666929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666896 and 666905.

It is not a weakly prime, because it can be changed into another prime (666437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333468 + 333469.

It is an arithmetic number, because the mean of its divisors is an integer number (333469).

2⁶⁶⁶⁹³⁷ is an apocalyptic number.

666937 is the 472-nd hex number.

It is an amenable number.

666937 is a deficient number, since it is larger than the sum of its proper divisors (1).

666937 is an equidigital number, since it uses as much as digits as its factorization.

666937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 666937 is about 816.6621088308. The cubic root of 666937 is about 87.3698527739.

It can be divided in two parts, 6669 and 37, that multiplied together give a triangular number (246753 = T₇₀₂).

The spelling of 666937 in words is "six hundred sixty-six thousand, nine hundred thirty-seven".