6649423936 has 21 divisors (see below), whose sum is σ = 13196245261. Its totient is φ = 3324385792.

The previous prime is 6649423931. The next prime is 6649423961. The reversal of 6649423936 is 6393249466.

The square root of 6649423936 is 81544.

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., 4761000000 + 1888423936 = 69000^2 + 43456^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6649423931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 647256 + ... + 657448.

Almost surely, 2^6649423936 is an apocalyptic number.

6649423936 is the 81544-th square number.

It is an amenable number.

6649423936 is a deficient number, since it is larger than the sum of its proper divisors (6546821325).

6649423936 is an frugal number, since it uses more digits than its factorization.

6649423936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20398 (or 10195 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 52.

The cubic root of 6649423936 is about 1880.4480537637.

The spelling of 6649423936 in words is "six billion, six hundred forty-nine million, four hundred twenty-three thousand, nine hundred thirty-six".