6687966317 has 2 divisors, whose sum is σ = 6687966318. Its totient is φ = 6687966316.

The previous prime is 6687966269. The next prime is 6687966347. The reversal of 6687966317 is 7136697866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3897380041 + 2790586276 = 62429^2 + 52826^2 .

It is a cyclic number.

It is not a de Polignac number, because 6687966317 - 2⁶ = 6687966253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6687966347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343983158 + 3343983159.

It is an arithmetic number, because the mean of its divisors is an integer number (3343983159).

Almost surely, 2^6687966317 is an apocalyptic number.

It is an amenable number.

6687966317 is a deficient number, since it is larger than the sum of its proper divisors (1).

6687966317 is an equidigital number, since it uses as much as digits as its factorization.

6687966317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 59.

The square root of 6687966317 is about 81779.9872646114. The cubic root of 6687966317 is about 1884.0743007564.

The spelling of 6687966317 in words is "six billion, six hundred eighty-seven million, nine hundred sixty-six thousand, three hundred seventeen".