6644111609 has 2 divisors, whose sum is σ = 6644111610. Its totient is φ = 6644111608.

The previous prime is 6644111603. The next prime is 6644111629. The reversal of 6644111609 is 9061114466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4284095209 + 2360016400 = 65453^2 + 48580^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644111609 - 2¹² = 6644107513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6644111603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322055804 + 3322055805.

It is an arithmetic number, because the mean of its divisors is an integer number (3322055805).

Almost surely, 2^6644111609 is an apocalyptic number.

It is an amenable number.

6644111609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644111609 is an equidigital number, since it uses as much as digits as its factorization.

6644111609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 6644111609 is about 81511.4201139938. The cubic root of 6644111609 is about 1879.9471473937.

The spelling of 6644111609 in words is "six billion, six hundred forty-four million, one hundred eleven thousand, six hundred nine".