6649216853 has 4 divisors (see below), whose sum is σ = 6790689600. Its totient is φ = 6507744108.

The previous prime is 6649216799. The next prime is 6649216859. The reversal of 6649216853 is 3586129466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6649216853 - 2¹⁰ = 6649215829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649216859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70736303 + ... + 70736396.

It is an arithmetic number, because the mean of its divisors is an integer number (1697672400).

Almost surely, 2^6649216853 is an apocalyptic number.

It is an amenable number.

6649216853 is a deficient number, since it is larger than the sum of its proper divisors (141472747).

6649216853 is a wasteful number, since it uses less digits than its factorization.

6649216853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141472746.

The product of its digits is 1866240, while the sum is 50.

The square root of 6649216853 is about 81542.7302277769. The cubic root of 6649216853 is about 1880.4285326308.

The spelling of 6649216853 in words is "six billion, six hundred forty-nine million, two hundred sixteen thousand, eight hundred fifty-three".