6686541929 has 2 divisors, whose sum is σ = 6686541930. Its totient is φ = 6686541928.

The previous prime is 6686541907. The next prime is 6686541941. The reversal of 6686541929 is 9291456866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3507837529 + 3178704400 = 59227^2 + 56380^2 .

It is a cyclic number.

It is not a de Polignac number, because 6686541929 - 2¹² = 6686537833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6686546929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343270964 + 3343270965.

It is an arithmetic number, because the mean of its divisors is an integer number (3343270965).

Almost surely, 2^6686541929 is an apocalyptic number.

It is an amenable number.

6686541929 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686541929 is an equidigital number, since it uses as much as digits as its factorization.

6686541929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 56.

The square root of 6686541929 is about 81771.2781421448. The cubic root of 6686541929 is about 1883.9405359596.

The spelling of 6686541929 in words is "six billion, six hundred eighty-six million, five hundred forty-one thousand, nine hundred twenty-nine".