6444776081 has 2 divisors, whose sum is σ = 6444776082. Its totient is φ = 6444776080.

The previous prime is 6444776077. The next prime is 6444776099. The reversal of 6444776081 is 1806774446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5250451600 + 1194324481 = 72460^2 + 34559^2 .

It is a cyclic number.

It is not a de Polignac number, because 6444776081 - 2² = 6444776077 is a prime.

It is a super-2 number, since 2×6444776081² = 83070277468459437122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6444776011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222388040 + 3222388041.

It is an arithmetic number, because the mean of its divisors is an integer number (3222388041).

Almost surely, 2^6444776081 is an apocalyptic number.

It is an amenable number.

6444776081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444776081 is an equidigital number, since it uses as much as digits as its factorization.

6444776081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 47.

The square root of 6444776081 is about 80279.3627341423. The cubic root of 6444776081 is about 1860.9553115685.

The spelling of 6444776081 in words is "six billion, four hundred forty-four million, seven hundred seventy-six thousand, eighty-one".