665902663 has 2 divisors, whose sum is σ = 665902664. Its totient is φ = 665902662.

The previous prime is 665902649. The next prime is 665902697. The reversal of 665902663 is 366209566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665902663 - 2⁹ = 665902151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665902603) 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, 332951331 + 332951332.

It is an arithmetic number, because the mean of its divisors is an integer number (332951332).

Almost surely, 2^665902663 is an apocalyptic number.

665902663 is a deficient number, since it is larger than the sum of its proper divisors (1).

665902663 is an equidigital number, since it uses as much as digits as its factorization.

665902663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 43.

The square root of 665902663 is about 25805.0898661485. The cubic root of 665902663 is about 873.2466278384.

The spelling of 665902663 in words is "six hundred sixty-five million, nine hundred two thousand, six hundred sixty-three".