668998829 has 2 divisors, whose sum is σ = 668998830. Its totient is φ = 668998828.

The previous prime is 668998787. The next prime is 668998831. The reversal of 668998829 is 928899866.

668998829 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 436893604 + 232105225 = 20902^2 + 15235^2 .

It is a cyclic number.

It is not a de Polignac number, because 668998829 - 2⁸ = 668998573 is a prime.

Together with 668998831, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668992829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334499414 + 334499415.

It is an arithmetic number, because the mean of its divisors is an integer number (334499415).

Almost surely, 2^668998829 is an apocalyptic number.

It is an amenable number.

668998829 is a deficient number, since it is larger than the sum of its proper divisors (1).

668998829 is an equidigital number, since it uses as much as digits as its factorization.

668998829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 65.

The square root of 668998829 is about 25865.0116760074. The cubic root of 668998829 is about 874.5979449200.

The spelling of 668998829 in words is "six hundred sixty-eight million, nine hundred ninety-eight thousand, eight hundred twenty-nine".