660617 has 2 divisors, whose sum is σ = 660618. Its totient is φ = 660616.

The previous prime is 660607. The next prime is 660619. The reversal of 660617 is 716066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373321 + 287296 = 611^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 660617 - 2⁴ = 660601 is a prime.

Together with 660619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330308 + 330309.

It is an arithmetic number, because the mean of its divisors is an integer number (330309).

2⁶⁶⁰⁶¹⁷ is an apocalyptic number.

It is an amenable number.

660617 is a deficient number, since it is larger than the sum of its proper divisors (1).

660617 is an equidigital number, since it uses as much as digits as its factorization.

660617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 660617 is about 812.7834890055. The cubic root of 660617 is about 87.0929995960.

The spelling of 660617 in words is "six hundred sixty thousand, six hundred seventeen".