6448344821 has 2 divisors, whose sum is σ = 6448344822. Its totient is φ = 6448344820.

The previous prime is 6448344787. The next prime is 6448344827. The reversal of 6448344821 is 1284438446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6211646596 + 236698225 = 78814^2 + 15385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6448344821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6448344827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224172410 + 3224172411.

It is an arithmetic number, because the mean of its divisors is an integer number (3224172411).

Almost surely, 2^6448344821 is an apocalyptic number.

It is an amenable number.

6448344821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6448344821 is an equidigital number, since it uses as much as digits as its factorization.

6448344821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 589824, while the sum is 44.

The square root of 6448344821 is about 80301.5866655199. The cubic root of 6448344821 is about 1861.2987442497.

The spelling of 6448344821 in words is "six billion, four hundred forty-eight million, three hundred forty-four thousand, eight hundred twenty-one".