6648396979 has 6 divisors (see below), whose sum is σ = 7733849604. Its totient is φ = 5698625940.

The previous prime is 6648396973. The next prime is 6648396983. The reversal of 6648396979 is 9796938466.

It is not a de Polignac number, because 6648396979 - 2⁵ = 6648396947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6648396973) 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 5 ways as a sum of consecutive naturals, for example, 67840737 + ... + 67840834.

It is an arithmetic number, because the mean of its divisors is an integer number (1288974934).

Almost surely, 2^6648396979 is an apocalyptic number.

6648396979 is a deficient number, since it is larger than the sum of its proper divisors (1085452625).

6648396979 is a wasteful number, since it uses less digits than its factorization.

6648396979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135681585 (or 135681578 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 67.

The square root of 6648396979 is about 81537.7028067384. The cubic root of 6648396979 is about 1880.3512414315.

The spelling of 6648396979 in words is "six billion, six hundred forty-eight million, three hundred ninety-six thousand, nine hundred seventy-nine".