665773 has 2 divisors, whose sum is σ = 665774. Its totient is φ = 665772.

The previous prime is 665761. The next prime is 665783. The reversal of 665773 is 377566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438244 + 227529 = 662^2 + 477^2 .

It is a cyclic number.

It is not a de Polignac number, because 665773 - 2¹³ = 657581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332886 + 332887.

It is an arithmetic number, because the mean of its divisors is an integer number (332887).

2⁶⁶⁵⁷⁷³ is an apocalyptic number.

It is an amenable number.

665773 is a deficient number, since it is larger than the sum of its proper divisors (1).

665773 is an equidigital number, since it uses as much as digits as its factorization.

665773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 34.

The square root of 665773 is about 815.9491405719. The cubic root of 665773 is about 87.3189945316.

The spelling of 665773 in words is "six hundred sixty-five thousand, seven hundred seventy-three".