6691090477 has 2 divisors, whose sum is σ = 6691090478. Its totient is φ = 6691090476.

The previous prime is 6691090447. The next prime is 6691090493. The reversal of 6691090477 is 7740901966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3917382921 + 2773707556 = 62589^2 + 52666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6691090477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6691090477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691090447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345545238 + 3345545239.

It is an arithmetic number, because the mean of its divisors is an integer number (3345545239).

Almost surely, 2^6691090477 is an apocalyptic number.

It is an amenable number.

6691090477 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691090477 is an equidigital number, since it uses as much as digits as its factorization.

6691090477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 6691090477 is about 81799.0860401264. The cubic root of 6691090477 is about 1884.3676252635.

The spelling of 6691090477 in words is "six billion, six hundred ninety-one million, ninety thousand, four hundred seventy-seven".