6691986127 has 2 divisors, whose sum is σ = 6691986128. Its totient is φ = 6691986126.

The previous prime is 6691986121. The next prime is 6691986149. The reversal of 6691986127 is 7216891966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6691986127 - 2¹⁹ = 6691461839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691986121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345993063 + 3345993064.

It is an arithmetic number, because the mean of its divisors is an integer number (3345993064).

Almost surely, 2^6691986127 is an apocalyptic number.

6691986127 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691986127 is an equidigital number, since it uses as much as digits as its factorization.

6691986127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The square root of 6691986127 is about 81804.5605513531. The cubic root of 6691986127 is about 1884.4517001773.

The spelling of 6691986127 in words is "six billion, six hundred ninety-one million, nine hundred eighty-six thousand, one hundred twenty-seven".