6668659397 has 2 divisors, whose sum is σ = 6668659398. Its totient is φ = 6668659396.

The previous prime is 6668659379. The next prime is 6668659433. The reversal of 6668659397 is 7939568666.

Together with previous prime (6668659379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4580717761 + 2087941636 = 67681^2 + 45694^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668659397 - 2¹⁴ = 6668643013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668659337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334329698 + 3334329699.

It is an arithmetic number, because the mean of its divisors is an integer number (3334329699).

Almost surely, 2^6668659397 is an apocalyptic number.

It is an amenable number.

6668659397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668659397 is an equidigital number, since it uses as much as digits as its factorization.

6668659397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88179840, while the sum is 65.

The square root of 6668659397 is about 81661.8601122948. The cubic root of 6668659397 is about 1882.2595621850.

The spelling of 6668659397 in words is "six billion, six hundred sixty-eight million, six hundred fifty-nine thousand, three hundred ninety-seven".