6448077821 has 2 divisors, whose sum is σ = 6448077822. Its totient is φ = 6448077820.

The previous prime is 6448077751. The next prime is 6448077827. The reversal of 6448077821 is 1287708446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5606265625 + 841812196 = 74875^2 + 29014^2 .

It is a cyclic number.

It is not a de Polignac number, because 6448077821 - 2¹⁴ = 6448061437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6448077827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224038910 + 3224038911.

It is an arithmetic number, because the mean of its divisors is an integer number (3224038911).

Almost surely, 2^6448077821 is an apocalyptic number.

It is an amenable number.

6448077821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6448077821 is an equidigital number, since it uses as much as digits as its factorization.

6448077821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602112, while the sum is 47.

The square root of 6448077821 is about 80299.9241655931. The cubic root of 6448077821 is about 1861.2730542658.

The spelling of 6448077821 in words is "six billion, four hundred forty-eight million, seventy-seven thousand, eight hundred twenty-one".