668209627 has 2 divisors, whose sum is σ = 668209628. Its totient is φ = 668209626.

The previous prime is 668209609. The next prime is 668209643. The reversal of 668209627 is 726902866.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668209627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668209657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334104813 + 334104814.

It is an arithmetic number, because the mean of its divisors is an integer number (334104814).

Almost surely, 2^668209627 is an apocalyptic number.

668209627 is a deficient number, since it is larger than the sum of its proper divisors (1).

668209627 is an equidigital number, since it uses as much as digits as its factorization.

668209627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 668209627 is about 25849.7510046035. The cubic root of 668209627 is about 874.2538954673.

The spelling of 668209627 in words is "six hundred sixty-eight million, two hundred nine thousand, six hundred twenty-seven".