6691567229 has 2 divisors, whose sum is σ = 6691567230. Its totient is φ = 6691567228.

The previous prime is 6691567159. The next prime is 6691567243. The reversal of 6691567229 is 9227651966.

6691567229 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6691567204 + 25 = 81802^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691567229 - 2¹² = 6691563133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691527229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345783614 + 3345783615.

It is an arithmetic number, because the mean of its divisors is an integer number (3345783615).

Almost surely, 2^6691567229 is an apocalyptic number.

It is an amenable number.

6691567229 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691567229 is an equidigital number, since it uses as much as digits as its factorization.

6691567229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The square root of 6691567229 is about 81802.0001528080. Note that the first 3 decimals coincide. The cubic root of 6691567229 is about 1884.4123790397.

The spelling of 6691567229 in words is "six billion, six hundred ninety-one million, five hundred sixty-seven thousand, two hundred twenty-nine".