660217 has 2 divisors, whose sum is σ = 660218. Its totient is φ = 660216.

The previous prime is 660199. The next prime is 660227. The reversal of 660217 is 712066.

660217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385641 + 274576 = 621^2 + 524^2 .

It is a cyclic number.

It is not a de Polignac number, because 660217 - 2¹¹ = 658169 is a prime.

It is a super-3 number, since 3×660217³ = 863339006539314939, which contains 333 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (660227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330108 + 330109.

It is an arithmetic number, because the mean of its divisors is an integer number (330109).

2⁶⁶⁰²¹⁷ is an apocalyptic number.

It is an amenable number.

660217 is a deficient number, since it is larger than the sum of its proper divisors (1).

660217 is an equidigital number, since it uses as much as digits as its factorization.

660217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 660217 is about 812.5373837554. The cubic root of 660217 is about 87.0754179345.

The spelling of 660217 in words is "six hundred sixty thousand, two hundred seventeen".