665760533 has 2 divisors, whose sum is σ = 665760534. Its totient is φ = 665760532.

The previous prime is 665760523. The next prime is 665760611. The reversal of 665760533 is 335067566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 665536804 + 223729 = 25798^2 + 473^2 .

It is a cyclic number.

It is not a de Polignac number, because 665760533 - 2⁴ = 665760517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665760503) 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, 332880266 + 332880267.

It is an arithmetic number, because the mean of its divisors is an integer number (332880267).

Almost surely, 2^665760533 is an apocalyptic number.

It is an amenable number.

665760533 is a deficient number, since it is larger than the sum of its proper divisors (1).

665760533 is an equidigital number, since it uses as much as digits as its factorization.

665760533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 41.

The square root of 665760533 is about 25802.3358051166. The cubic root of 665760533 is about 873.1844949465.

The spelling of 665760533 in words is "six hundred sixty-five million, seven hundred sixty thousand, five hundred thirty-three".