665042863 has 2 divisors, whose sum is σ = 665042864. Its totient is φ = 665042862.

The previous prime is 665042857. The next prime is 665042893. The reversal of 665042863 is 368240566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665042863 - 2⁵ = 665042831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665042803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332521431 + 332521432.

It is an arithmetic number, because the mean of its divisors is an integer number (332521432).

Almost surely, 2^665042863 is an apocalyptic number.

665042863 is a deficient number, since it is larger than the sum of its proper divisors (1).

665042863 is an equidigital number, since it uses as much as digits as its factorization.

665042863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 665042863 is about 25788.4249809871. The cubic root of 665042863 is about 872.8706265241.

The spelling of 665042863 in words is "six hundred sixty-five million, forty-two thousand, eight hundred sixty-three".