668303957 has 2 divisors, whose sum is σ = 668303958. Its totient is φ = 668303956.

The previous prime is 668303849. The next prime is 668303959. The reversal of 668303957 is 759303866.

668303957 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., 344807761 + 323496196 = 18569^2 + 17986^2 .

It is a cyclic number.

It is not a de Polignac number, because 668303957 - 2¹² = 668299861 is a prime.

Together with 668303959, 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 (668303959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334151978 + 334151979.

It is an arithmetic number, because the mean of its divisors is an integer number (334151979).

Almost surely, 2^668303957 is an apocalyptic number.

It is an amenable number.

668303957 is a deficient number, since it is larger than the sum of its proper divisors (1).

668303957 is an equidigital number, since it uses as much as digits as its factorization.

668303957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 47.

The square root of 668303957 is about 25851.5755225866. The cubic root of 668303957 is about 874.2950325029.

Subtracting 668303957 from its reverse (759303866), we obtain a palindrome (90999909).

The spelling of 668303957 in words is "six hundred sixty-eight million, three hundred three thousand, nine hundred fifty-seven".