6691099589 has 2 divisors, whose sum is σ = 6691099590. Its totient is φ = 6691099588.

The previous prime is 6691099537. The next prime is 6691099601. The reversal of 6691099589 is 9859901966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3606963364 + 3084136225 = 60058^2 + 55535^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691099589 - 2¹² = 6691095493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691090589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345549794 + 3345549795.

It is an arithmetic number, because the mean of its divisors is an integer number (3345549795).

Almost surely, 2^6691099589 is an apocalyptic number.

It is an amenable number.

6691099589 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691099589 is an equidigital number, since it uses as much as digits as its factorization.

6691099589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9447840, while the sum is 62.

The square root of 6691099589 is about 81799.1417375513. The cubic root of 6691099589 is about 1884.3684806472.

The spelling of 6691099589 in words is "six billion, six hundred ninety-one million, ninety-nine thousand, five hundred eighty-nine".