666224017 has 2 divisors, whose sum is σ = 666224018. Its totient is φ = 666224016.

The previous prime is 666224011. The next prime is 666224021. The reversal of 666224017 is 710422666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466171281 + 200052736 = 21591^2 + 14144^2 .

It is a cyclic number.

It is not a de Polignac number, because 666224017 - 2¹⁵ = 666191249 is a prime.

It is not a weakly prime, because it can be changed into another prime (666224011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333112008 + 333112009.

It is an arithmetic number, because the mean of its divisors is an integer number (333112009).

Almost surely, 2^666224017 is an apocalyptic number.

It is an amenable number.

666224017 is a deficient number, since it is larger than the sum of its proper divisors (1).

666224017 is an equidigital number, since it uses as much as digits as its factorization.

666224017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 666224017 is about 25811.3156774311. The cubic root of 666224017 is about 873.3870768777.

The spelling of 666224017 in words is "six hundred sixty-six million, two hundred twenty-four thousand, seventeen".