6646993609 has 2 divisors, whose sum is σ = 6646993610. Its totient is φ = 6646993608.

The previous prime is 6646993589. The next prime is 6646993627. The reversal of 6646993609 is 9063996466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4572464400 + 2074529209 = 67620^2 + 45547^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646993609 - 2⁹ = 6646993097 is a prime.

It is not a weakly prime, because it can be changed into another prime (6646993669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323496804 + 3323496805.

It is an arithmetic number, because the mean of its divisors is an integer number (3323496805).

Almost surely, 2^6646993609 is an apocalyptic number.

It is an amenable number.

6646993609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646993609 is an equidigital number, since it uses as much as digits as its factorization.

6646993609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11337408, while the sum is 58.

The square root of 6646993609 is about 81529.0967017297. The cubic root of 6646993609 is about 1880.2189281224.

The spelling of 6646993609 in words is "six billion, six hundred forty-six million, nine hundred ninety-three thousand, six hundred nine".