6644224447 has 4 divisors (see below), whose sum is σ = 7593399376. Its totient is φ = 5695049520.

The previous prime is 6644224439. The next prime is 6644224459. The reversal of 6644224447 is 7444224466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6644224447 - 2³ = 6644224439 is a prime.

It is a super-2 number, since 2×6644224447² = 88291437004224911618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644224547) 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 3 ways as a sum of consecutive naturals, for example, 474587454 + ... + 474587467.

It is an arithmetic number, because the mean of its divisors is an integer number (1898349844).

Almost surely, 2^6644224447 is an apocalyptic number.

6644224447 is a deficient number, since it is larger than the sum of its proper divisors (949174929).

6644224447 is an equidigital number, since it uses as much as digits as its factorization.

6644224447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949174928.

The product of its digits is 1032192, while the sum is 43.

The square root of 6644224447 is about 81512.1122717354. The cubic root of 6644224447 is about 1879.9577898136.

The spelling of 6644224447 in words is "six billion, six hundred forty-four million, two hundred twenty-four thousand, four hundred forty-seven".