665366437 has 2 divisors, whose sum is σ = 665366438. Its totient is φ = 665366436.

The previous prime is 665366431. The next prime is 665366447. The reversal of 665366437 is 734663566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362293156 + 303073281 = 19034^2 + 17409^2 .

It is a cyclic number.

It is not a de Polignac number, because 665366437 - 2⁷ = 665366309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665366431) 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, 332683218 + 332683219.

It is an arithmetic number, because the mean of its divisors is an integer number (332683219).

Almost surely, 2^665366437 is an apocalyptic number.

It is an amenable number.

665366437 is a deficient number, since it is larger than the sum of its proper divisors (1).

665366437 is an equidigital number, since it uses as much as digits as its factorization.

665366437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 46.

The square root of 665366437 is about 25794.6978466506. The cubic root of 665366437 is about 873.0121674993.

The spelling of 665366437 in words is "six hundred sixty-five million, three hundred sixty-six thousand, four hundred thirty-seven".