6649838919 has 12 divisors (see below), whose sum is σ = 9607920400. Its totient is φ = 4432027104.

The previous prime is 6649838911. The next prime is 6649838953. The reversal of 6649838919 is 9198389466.

It is a happy number.

6649838919 is a `hidden beast` number, since 66 + 498 + 3 + 89 + 1 + 9 = 666.

It is not a de Polignac number, because 6649838919 - 2³ = 6649838911 is a prime.

It is a super-2 number, since 2×6649838919² = 88440715297294177122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649838911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64099 + ... + 131940.

Almost surely, 2^6649838919 is an apocalyptic number.

6649838919 is a deficient number, since it is larger than the sum of its proper divisors (2958081481).

6649838919 is a wasteful number, since it uses less digits than its factorization.

6649838919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199814 (or 199811 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 6649838919 is about 81546.5444945400. The cubic root of 6649838919 is about 1880.4871718262.

The spelling of 6649838919 in words is "six billion, six hundred forty-nine million, eight hundred thirty-eight thousand, nine hundred nineteen".