666245317229 has 2 divisors, whose sum is σ = 666245317230. Its totient is φ = 666245317228.

The previous prime is 666245317201. The next prime is 666245317259. The reversal of 666245317229 is 922713542666.

It is a happy number.

666245317229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376752895204 + 289492422025 = 613802^2 + 538045^2 .

It is a cyclic number.

It is not a de Polignac number, because 666245317229 - 2¹² = 666245313133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666245317259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333122658614 + 333122658615.

It is an arithmetic number, because the mean of its divisors is an integer number (333122658615).

Almost surely, 2^666245317229 is an apocalyptic number.

It is an amenable number.

666245317229 is a deficient number, since it is larger than the sum of its proper divisors (1).

666245317229 is an equidigital number, since it uses as much as digits as its factorization.

666245317229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 53.

The spelling of 666245317229 in words is "six hundred sixty-six billion, two hundred forty-five million, three hundred seventeen thousand, two hundred twenty-nine".