6649769659 has 4 divisors (see below), whose sum is σ = 7161290416. Its totient is φ = 6138248904.

The previous prime is 6649769653. The next prime is 6649769747. The reversal of 6649769659 is 9569679466.

6649769659 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6649769659 - 2⁵ = 6649769627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6649769594 and 6649769603.

It is not an unprimeable number, because it can be changed into a prime (6649769653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255760359 + ... + 255760384.

It is an arithmetic number, because the mean of its divisors is an integer number (1790322604).

Almost surely, 2^6649769659 is an apocalyptic number.

6649769659 is a deficient number, since it is larger than the sum of its proper divisors (511520757).

6649769659 is a wasteful number, since it uses less digits than its factorization.

6649769659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511520756.

The product of its digits is 132269760, while the sum is 67.

The square root of 6649769659 is about 81546.1198279845. The cubic root of 6649769659 is about 1880.4806431972.

The spelling of 6649769659 in words is "six billion, six hundred forty-nine million, seven hundred sixty-nine thousand, six hundred fifty-nine".