6649260849 has 81 divisors (see below), whose sum is σ = 12315478539. Its totient is φ = 3444376320.

The previous prime is 6649260791. The next prime is 6649260869. The reversal of 6649260849 is 9480629466.

The square root of 6649260849 is 81543.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2701400625 + 3947860224 = 51975^2 + 62832^2 .

It is not a de Polignac number, because 6649260849 - 2⁷ = 6649260721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6649260795 and 6649260804.

It is not an unprimeable number, because it can be changed into a prime (6649260869) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 18836257 + ... + 18836609.

Almost surely, 2^6649260849 is an apocalyptic number.

6649260849 is the 81543-rd square number.

6649260849 is the 40772-nd centered octagonal number.

It is an amenable number.

6649260849 is a deficient number, since it is larger than the sum of its proper divisors (5666217690).

6649260849 is a wasteful number, since it uses less digits than its factorization.

6649260849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The cubic root of 6649260849 is about 1880.4326800441.

The spelling of 6649260849 in words is "six billion, six hundred forty-nine million, two hundred sixty thousand, eight hundred forty-nine".