665017 has 2 divisors, whose sum is σ = 665018. Its totient is φ = 665016.

The previous prime is 665011. The next prime is 665029. The reversal of 665017 is 710566.

665017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346921 + 318096 = 589^2 + 564^2 .

It is a cyclic number.

It is not a de Polignac number, because 665017 - 2¹⁹ = 140729 is a prime.

It is a super-2 number, since 2×665017² = 884495220578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664982 and 665000.

It is not a weakly prime, because it can be changed into another prime (665011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332508 + 332509.

It is an arithmetic number, because the mean of its divisors is an integer number (332509).

2⁶⁶⁵⁰¹⁷ is an apocalyptic number.

It is an amenable number.

665017 is a deficient number, since it is larger than the sum of its proper divisors (1).

665017 is an equidigital number, since it uses as much as digits as its factorization.

665017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 665017 is about 815.4857448172. The cubic root of 665017 is about 87.2859311291.

It can be divided in two parts, 6650 and 17, that multiplied together give a triangular number (113050 = T₄₇₅).

The spelling of 665017 in words is "six hundred sixty-five thousand, seventeen".