665783 has 2 divisors, whose sum is σ = 665784. Its totient is φ = 665782.

The previous prime is 665773. The next prime is 665789. The reversal of 665783 is 387566.

It is a happy number.

665783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665783 - 2⁶ = 665719 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665783.

It is not a weakly prime, because it can be changed into another prime (665789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332891 + 332892.

It is an arithmetic number, because the mean of its divisors is an integer number (332892).

2⁶⁶⁵⁷⁸³ is an apocalyptic number.

665783 is a deficient number, since it is larger than the sum of its proper divisors (1).

665783 is an equidigital number, since it uses as much as digits as its factorization.

665783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 665783 is about 815.9552683818. The cubic root of 665783 is about 87.3194317104.

The spelling of 665783 in words is "six hundred sixty-five thousand, seven hundred eighty-three".