6448442321 has 4 divisors (see below), whose sum is σ = 6605721444. Its totient is φ = 6291163200.

The previous prime is 6448442267. The next prime is 6448442359. The reversal of 6448442321 is 1232448446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1232448446 = 2 ⋅616224223.

It can be written as a sum of positive squares in 2 ways, for example, as 2209000000 + 4239442321 = 47000^2 + 65111^2 .

It is a cyclic number.

It is not a de Polignac number, because 6448442321 - 2⁶ = 6448442257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6448447321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78639500 + ... + 78639581.

It is an arithmetic number, because the mean of its divisors is an integer number (1651430361).

Almost surely, 2^6448442321 is an apocalyptic number.

It is an amenable number.

6448442321 is a deficient number, since it is larger than the sum of its proper divisors (157279123).

6448442321 is a wasteful number, since it uses less digits than its factorization.

6448442321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157279122.

The product of its digits is 147456, while the sum is 38.

The square root of 6448442321 is about 80302.1937496106. The cubic root of 6448442321 is about 1861.3081252469.

The spelling of 6448442321 in words is "six billion, four hundred forty-eight million, four hundred forty-two thousand, three hundred twenty-one".