668917357 has 2 divisors, whose sum is σ = 668917358. Its totient is φ = 668917356.

The previous prime is 668917351. The next prime is 668917369. The reversal of 668917357 is 753719866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662084361 + 6832996 = 25731^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 668917357 - 2¹⁹ = 668393069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668917351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334458678 + 334458679.

It is an arithmetic number, because the mean of its divisors is an integer number (334458679).

Almost surely, 2^668917357 is an apocalyptic number.

It is an amenable number.

668917357 is a deficient number, since it is larger than the sum of its proper divisors (1).

668917357 is an equidigital number, since it uses as much as digits as its factorization.

668917357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 52.

The square root of 668917357 is about 25863.4366819261. The cubic root of 668917357 is about 874.5624400565.

The spelling of 668917357 in words is "six hundred sixty-eight million, nine hundred seventeen thousand, three hundred fifty-seven".