668888867 has 2 divisors, whose sum is σ = 668888868. Its totient is φ = 668888866.

The previous prime is 668888861. The next prime is 668888873. The reversal of 668888867 is 768888866.

It is a balanced prime because it is at equal distance from previous prime (668888861) and next prime (668888873).

It is a cyclic number.

It is not a de Polignac number, because 668888867 - 2⁸ = 668888611 is a prime.

It is not a weakly prime, because it can be changed into another prime (668888861) 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, 334444433 + 334444434.

It is an arithmetic number, because the mean of its divisors is an integer number (334444434).

Almost surely, 2^668888867 is an apocalyptic number.

668888867 is a deficient number, since it is larger than the sum of its proper divisors (1).

668888867 is an equidigital number, since it uses as much as digits as its factorization.

668888867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49545216, while the sum is 65.

The square root of 668888867 is about 25862.8858985226. The cubic root of 668888867 is about 874.5500236558.

Subtracting 668888867 from its reverse (768888866), we obtain a palindrome (99999999).

The spelling of 668888867 in words is "six hundred sixty-eight million, eight hundred eighty-eight thousand, eight hundred sixty-seven".