6644043331 has 4 divisors (see below), whose sum is σ = 6646801464. Its totient is φ = 6641285200.

The previous prime is 6644043319. The next prime is 6644043359. The reversal of 6644043331 is 1333404466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1333404466 = 2 ⋅666702233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6644043331 is a prime.

It is a super-2 number, since 2×6644043331² = 88286623568411151122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6644043311) 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 3 ways as a sum of consecutive naturals, for example, 1375450 + ... + 1380271.

It is an arithmetic number, because the mean of its divisors is an integer number (1661700366).

Almost surely, 2^6644043331 is an apocalyptic number.

6644043331 is a deficient number, since it is larger than the sum of its proper divisors (2758133).

6644043331 is a wasteful number, since it uses less digits than its factorization.

6644043331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758132.

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 6644043331 is about 81511.0012881697. The cubic root of 6644043331 is about 1879.9407076328.

Adding to 6644043331 its reverse (1333404466), we get a palindrome (7977447797).

The spelling of 6644043331 in words is "six billion, six hundred forty-four million, forty-three thousand, three hundred thirty-one".