6649975789 has 2 divisors, whose sum is σ = 6649975790. Its totient is φ = 6649975788.

The previous prime is 6649975751. The next prime is 6649975831. The reversal of 6649975789 is 9875799466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5868326025 + 781649764 = 76605^2 + 27958^2 .

It is a cyclic number.

It is not a de Polignac number, because 6649975789 - 2¹⁷ = 6649844717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6649975729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324987894 + 3324987895.

It is an arithmetic number, because the mean of its divisors is an integer number (3324987895).

Almost surely, 2^6649975789 is an apocalyptic number.

It is an amenable number.

6649975789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649975789 is an equidigital number, since it uses as much as digits as its factorization.

6649975789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 205752960, while the sum is 70.

The square root of 6649975789 is about 81547.3837041999. The cubic root of 6649975789 is about 1880.5000734175.

The spelling of 6649975789 in words is "six billion, six hundred forty-nine million, nine hundred seventy-five thousand, seven hundred eighty-nine".