668852257 has 2 divisors, whose sum is σ = 668852258. Its totient is φ = 668852256.

The previous prime is 668852243. The next prime is 668852273. The reversal of 668852257 is 752258866.

668852257 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., 414896161 + 253956096 = 20369^2 + 15936^2 .

It is a cyclic number.

It is not a de Polignac number, because 668852257 - 2¹¹ = 668850209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668852257.

It is not a weakly prime, because it can be changed into another prime (668852237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334426128 + 334426129.

It is an arithmetic number, because the mean of its divisors is an integer number (334426129).

Almost surely, 2^668852257 is an apocalyptic number.

It is an amenable number.

668852257 is a deficient number, since it is larger than the sum of its proper divisors (1).

668852257 is an equidigital number, since it uses as much as digits as its factorization.

668852257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 49.

The square root of 668852257 is about 25862.1781178616. The cubic root of 668852257 is about 874.5340679109.

The spelling of 668852257 in words is "six hundred sixty-eight million, eight hundred fifty-two thousand, two hundred fifty-seven".