666229 has 2 divisors, whose sum is σ = 666230. Its totient is φ = 666228.

The previous prime is 666203. The next prime is 666233. The reversal of 666229 is 922666.

666229 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., 603729 + 62500 = 777^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 666229 - 2¹⁵ = 633461 is a prime.

It is a super-2 number, since 2×666229² = 887722160882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333114 + 333115.

It is an arithmetic number, because the mean of its divisors is an integer number (333115).

2⁶⁶⁶²²⁹ is an apocalyptic number.

It is an amenable number.

666229 is a deficient number, since it is larger than the sum of its proper divisors (1).

666229 is an equidigital number, since it uses as much as digits as its factorization.

666229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 666229 is about 816.2285219226. The cubic root of 666229 is about 87.3389254362.

It can be divided in two parts, 66 and 6229, that multiplied together give a palindrome (411114).

The spelling of 666229 in words is "six hundred sixty-six thousand, two hundred twenty-nine".