665043437 has 2 divisors, whose sum is σ = 665043438. Its totient is φ = 665043436.

The previous prime is 665043433. The next prime is 665043443. The reversal of 665043437 is 734340566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652751401 + 12292036 = 25549^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 665043437 - 2² = 665043433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665043437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665043433) 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, 332521718 + 332521719.

It is an arithmetic number, because the mean of its divisors is an integer number (332521719).

Almost surely, 2^665043437 is an apocalyptic number.

It is an amenable number.

665043437 is a deficient number, since it is larger than the sum of its proper divisors (1).

665043437 is an equidigital number, since it uses as much as digits as its factorization.

665043437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 38.

The square root of 665043437 is about 25788.4361100087. The cubic root of 665043437 is about 872.8708776496.

The spelling of 665043437 in words is "six hundred sixty-five million, forty-three thousand, four hundred thirty-seven".