6647368791 has 16 divisors (see below), whose sum is σ = 10169687808. Its totient is φ = 3783360000.

The previous prime is 6647368757. The next prime is 6647368807. The reversal of 6647368791 is 1978637466.

6647368791 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6647368791 - 2¹⁰ = 6647367767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647368711) 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 15 ways as a sum of consecutive naturals, for example, 625290 + ... + 635831.

It is an arithmetic number, because the mean of its divisors is an integer number (635605488).

Almost surely, 2^6647368791 is an apocalyptic number.

6647368791 is a deficient number, since it is larger than the sum of its proper divisors (3522319017).

6647368791 is a wasteful number, since it uses less digits than its factorization.

6647368791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261382.

The product of its digits is 9144576, while the sum is 57.

The square root of 6647368791 is about 81531.3975778657. The cubic root of 6647368791 is about 1880.2543030636.

The spelling of 6647368791 in words is "six billion, six hundred forty-seven million, three hundred sixty-eight thousand, seven hundred ninety-one".