6441221377 has 2 divisors, whose sum is σ = 6441221378. Its totient is φ = 6441221376.

The previous prime is 6441221359. The next prime is 6441221419. The reversal of 6441221377 is 7731221446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6238472256 + 202749121 = 78984^2 + 14239^2 .

It is a cyclic number.

It is not a de Polignac number, because 6441221377 - 2¹⁵ = 6441188609 is a prime.

It is a super-2 number, since 2×6441221377² = 82978665655043552258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6421221377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220610688 + 3220610689.

It is an arithmetic number, because the mean of its divisors is an integer number (3220610689).

Almost surely, 2^6441221377 is an apocalyptic number.

It is an amenable number.

6441221377 is a deficient number, since it is larger than the sum of its proper divisors (1).

6441221377 is an equidigital number, since it uses as much as digits as its factorization.

6441221377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 37.

The square root of 6441221377 is about 80257.2200926496. The cubic root of 6441221377 is about 1860.6131035640.

The spelling of 6441221377 in words is "six billion, four hundred forty-one million, two hundred twenty-one thousand, three hundred seventy-seven".