666929 has 2 divisors, whose sum is σ = 666930. Its totient is φ = 666928.

The previous prime is 666901. The next prime is 666937. The reversal of 666929 is 929666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 2704 = 815^2 + 52^2 .

It is a cyclic number.

It is not a de Polignac number, because 666929 - 2¹² = 662833 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 666892 and 666901.

It is not a weakly prime, because it can be changed into another prime (666959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333464 + 333465.

It is an arithmetic number, because the mean of its divisors is an integer number (333465).

2⁶⁶⁶⁹²⁹ is an apocalyptic number.

It is an amenable number.

666929 is a deficient number, since it is larger than the sum of its proper divisors (1).

666929 is an equidigital number, since it uses as much as digits as its factorization.

666929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 38.

The square root of 666929 is about 816.6572108296. The cubic root of 666929 is about 87.3695034348.

The spelling of 666929 in words is "six hundred sixty-six thousand, nine hundred twenty-nine".