666773 has 2 divisors, whose sum is σ = 666774. Its totient is φ = 666772.

The previous prime is 666769. The next prime is 666811. The reversal of 666773 is 377666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508369 + 158404 = 713^2 + 398^2 .

It is a cyclic number.

It is not a de Polignac number, because 666773 - 2² = 666769 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333386 + 333387.

It is an arithmetic number, because the mean of its divisors is an integer number (333387).

2⁶⁶⁶⁷⁷³ is an apocalyptic number.

It is an amenable number.

666773 is a deficient number, since it is larger than the sum of its proper divisors (1).

666773 is an equidigital number, since it uses as much as digits as its factorization.

666773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 35.

The square root of 666773 is about 816.5616939338. The cubic root of 666773 is about 87.3626907629.

The spelling of 666773 in words is "six hundred sixty-six thousand, seven hundred seventy-three".