665266079 has 2 divisors, whose sum is σ = 665266080. Its totient is φ = 665266078.

The previous prime is 665266073. The next prime is 665266139. The reversal of 665266079 is 970662566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665266079 - 2¹² = 665261983 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 (665266073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332633039 + 332633040.

It is an arithmetic number, because the mean of its divisors is an integer number (332633040).

Almost surely, 2^665266079 is an apocalyptic number.

665266079 is a deficient number, since it is larger than the sum of its proper divisors (1).

665266079 is an equidigital number, since it uses as much as digits as its factorization.

665266079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 47.

The square root of 665266079 is about 25792.7524510278. The cubic root of 665266079 is about 872.9682728093.

The spelling of 665266079 in words is "six hundred sixty-five million, two hundred sixty-six thousand, seventy-nine".