4449665643 has 8 divisors (see below), whose sum is σ = 5935541568. Its totient is φ = 2965116744.

The previous prime is 4449665587. The next prime is 4449665657. The reversal of 4449665643 is 3465669444.

4449665643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 4449665643 - 2¹⁸ = 4449403499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4449665683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323905 + ... + 337362.

It is an arithmetic number, because the mean of its divisors is an integer number (741942696).

Almost surely, 2^4449665643 is an apocalyptic number.

4449665643 is a deficient number, since it is larger than the sum of its proper divisors (1485875925).

4449665643 is a wasteful number, since it uses less digits than its factorization.

4449665643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663513.

The product of its digits is 7464960, while the sum is 51.

The square root of 4449665643 is about 66705.8141618855. The cubic root of 4449665643 is about 1644.7849600804.

The spelling of 4449665643 in words is "four billion, four hundred forty-nine million, six hundred sixty-five thousand, six hundred forty-three".