6649165809 has 96 divisors (see below), whose sum is σ = 11643375744. Its totient is φ = 3602672640.

The previous prime is 6649165807. The next prime is 6649165819. The reversal of 6649165809 is 9085619466.

It is a happy number.

6649165809 is a `hidden beast` number, since 6 + 6 + 49 + 16 + 580 + 9 = 666.

It is not a de Polignac number, because 6649165809 - 2¹ = 6649165807 is a prime.

It is a super-2 number, since 2×6649165809² = 88422811911149248962, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6649165807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7581279 + ... + 7582155.

It is an arithmetic number, because the mean of its divisors is an integer number (121285164).

Almost surely, 2^6649165809 is an apocalyptic number.

It is an amenable number.

6649165809 is a deficient number, since it is larger than the sum of its proper divisors (4994209935).

6649165809 is a wasteful number, since it uses less digits than its factorization.

6649165809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087 (or 1084 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 6649165809 is about 81542.4172379014. The cubic root of 6649165809 is about 1880.4237207939.

The spelling of 6649165809 in words is "six billion, six hundred forty-nine million, one hundred sixty-five thousand, eight hundred nine".