6441221641 has 2 divisors, whose sum is σ = 6441221642. Its totient is φ = 6441221640.

The previous prime is 6441221603. The next prime is 6441221663. The reversal of 6441221641 is 1461221446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5824742400 + 616479241 = 76320^2 + 24829^2 .

It is a cyclic number.

It is not a de Polignac number, because 6441221641 - 2⁷ = 6441221513 is a prime.

It is not a weakly prime, because it can be changed into another prime (6441221671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220610820 + 3220610821.

It is an arithmetic number, because the mean of its divisors is an integer number (3220610821).

Almost surely, 2^6441221641 is an apocalyptic number.

It is an amenable number.

6441221641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6441221641 is an equidigital number, since it uses as much as digits as its factorization.

6441221641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 6441221641 is about 80257.2217373614. The cubic root of 6441221641 is about 1860.6131289837.

The spelling of 6441221641 in words is "six billion, four hundred forty-one million, two hundred twenty-one thousand, six hundred forty-one".