666263207 has 2 divisors, whose sum is σ = 666263208. Its totient is φ = 666263206.

The previous prime is 666263203. The next prime is 666263261. The reversal of 666263207 is 702362666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666263207 - 2² = 666263203 is a prime.

It is a super-2 number, since 2×666263207² = 887813322003849698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666263203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333131603 + 333131604.

It is an arithmetic number, because the mean of its divisors is an integer number (333131604).

Almost surely, 2^666263207 is an apocalyptic number.

666263207 is a deficient number, since it is larger than the sum of its proper divisors (1).

666263207 is an equidigital number, since it uses as much as digits as its factorization.

666263207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 38.

The square root of 666263207 is about 25812.0748294282. The cubic root of 666263207 is about 873.4042019325.

The spelling of 666263207 in words is "six hundred sixty-six million, two hundred sixty-three thousand, two hundred seven".