665117 has 2 divisors, whose sum is σ = 665118. Its totient is φ = 665116.

The previous prime is 665113. The next prime is 665123. The reversal of 665117 is 711566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657721 + 7396 = 811^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 665117 - 2² = 665113 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665117.

It is not a weakly prime, because it can be changed into another prime (665111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332558 + 332559.

It is an arithmetic number, because the mean of its divisors is an integer number (332559).

2⁶⁶⁵¹¹⁷ is an apocalyptic number.

It is an amenable number.

665117 is a deficient number, since it is larger than the sum of its proper divisors (1).

665117 is an equidigital number, since it uses as much as digits as its factorization.

665117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 26.

The square root of 665117 is about 815.5470556626. The cubic root of 665117 is about 87.2903060326.

The spelling of 665117 in words is "six hundred sixty-five thousand, one hundred seventeen".