668346929 has 2 divisors, whose sum is σ = 668346930. Its totient is φ = 668346928.

The previous prime is 668346923. The next prime is 668346937. The reversal of 668346929 is 929643866.

668346929 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., 668325904 + 21025 = 25852^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 668346929 - 2¹² = 668342833 is a prime.

It is not a weakly prime, because it can be changed into another prime (668346923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334173464 + 334173465.

It is an arithmetic number, because the mean of its divisors is an integer number (334173465).

Almost surely, 2^668346929 is an apocalyptic number.

It is an amenable number.

668346929 is a deficient number, since it is larger than the sum of its proper divisors (1).

668346929 is an equidigital number, since it uses as much as digits as its factorization.

668346929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 53.

The square root of 668346929 is about 25852.4066384544. The cubic root of 668346929 is about 874.3137711823.

The spelling of 668346929 in words is "six hundred sixty-eight million, three hundred forty-six thousand, nine hundred twenty-nine".