6644224465 has 8 divisors (see below), whose sum is σ = 7975251648. Its totient is φ = 5313924720.

The previous prime is 6644224459. The next prime is 6644224469. The reversal of 6644224465 is 5644224466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6644224465 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6644224469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161557 + ... + 198466.

It is an arithmetic number, because the mean of its divisors is an integer number (996906456).

Almost surely, 2^6644224465 is an apocalyptic number.

It is an amenable number.

6644224465 is a deficient number, since it is larger than the sum of its proper divisors (1331027183).

6644224465 is a wasteful number, since it uses less digits than its factorization.

6644224465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363719.

The product of its digits is 1105920, while the sum is 43.

The square root of 6644224465 is about 81512.1123821485. The cubic root of 6644224465 is about 1879.9577915113.

Subtracting from 6644224465 its reverse (5644224466), we obtain a palindrome (999999999).

The spelling of 6644224465 in words is "six billion, six hundred forty-four million, two hundred twenty-four thousand, four hundred sixty-five".