6691099601 has 2 divisors, whose sum is σ = 6691099602. Its totient is φ = 6691099600.

The previous prime is 6691099589. The next prime is 6691099607. The reversal of 6691099601 is 1069901966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4051195201 + 2639904400 = 63649^2 + 51380^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691099601 - 2⁶ = 6691099537 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 (6691099607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345549800 + 3345549801.

It is an arithmetic number, because the mean of its divisors is an integer number (3345549801).

Almost surely, 2^6691099601 is an apocalyptic number.

It is an amenable number.

6691099601 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691099601 is an equidigital number, since it uses as much as digits as its factorization.

6691099601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 6691099601 is about 81799.1418109017. The cubic root of 6691099601 is about 1884.3684817737.

The spelling of 6691099601 in words is "six billion, six hundred ninety-one million, ninety-nine thousand, six hundred one".