668880841 has 2 divisors, whose sum is σ = 668880842. Its totient is φ = 668880840.

The previous prime is 668880809. The next prime is 668880887. The reversal of 668880841 is 148088866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619810816 + 49070025 = 24896^2 + 7005^2 .

It is a cyclic number.

It is not a de Polignac number, because 668880841 - 2⁵ = 668880809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668880941) 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, 334440420 + 334440421.

It is an arithmetic number, because the mean of its divisors is an integer number (334440421).

Almost surely, 2^668880841 is an apocalyptic number.

It is an amenable number.

668880841 is a deficient number, since it is larger than the sum of its proper divisors (1).

668880841 is an equidigital number, since it uses as much as digits as its factorization.

668880841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 589824, while the sum is 49.

The square root of 668880841 is about 25862.7307336252. The cubic root of 668880841 is about 874.5465257322.

The spelling of 668880841 in words is "six hundred sixty-eight million, eight hundred eighty thousand, eight hundred forty-one".