668617 has 2 divisors, whose sum is σ = 668618. Its totient is φ = 668616.

The previous prime is 668611. The next prime is 668623. The reversal of 668617 is 716866.

668617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (668611) and next prime (668623).

It can be written as a sum of positive squares in only one way, i.e., 646416 + 22201 = 804^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 668617 - 2³ = 668609 is a prime.

It is a super-3 number, since 3×668617³ = 896713067278923339, which contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (668611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334308 + 334309.

It is an arithmetic number, because the mean of its divisors is an integer number (334309).

2⁶⁶⁸⁶¹⁷ is an apocalyptic number.

It is an amenable number.

668617 is a deficient number, since it is larger than the sum of its proper divisors (1).

668617 is an equidigital number, since it uses as much as digits as its factorization.

668617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 668617 is about 817.6900390735. The cubic root of 668617 is about 87.4431521902.

The spelling of 668617 in words is "six hundred sixty-eight thousand, six hundred seventeen".