665760523 has 2 divisors, whose sum is σ = 665760524. Its totient is φ = 665760522.

The previous prime is 665760521. The next prime is 665760533. The reversal of 665760523 is 325067566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665760523 - 2¹ = 665760521 is a prime.

Together with 665760521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (665760521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332880261 + 332880262.

It is an arithmetic number, because the mean of its divisors is an integer number (332880262).

Almost surely, 2^665760523 is an apocalyptic number.

665760523 is a deficient number, since it is larger than the sum of its proper divisors (1).

665760523 is an equidigital number, since it uses as much as digits as its factorization.

665760523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 40.

The square root of 665760523 is about 25802.3356113357. The cubic root of 665760523 is about 873.1844905746.

The spelling of 665760523 in words is "six hundred sixty-five million, seven hundred sixty thousand, five hundred twenty-three".