6644591105 has 16 divisors (see below), whose sum is σ = 8095057920. Its totient is φ = 5235253632.

The previous prime is 6644591101. The next prime is 6644591123. The reversal of 6644591105 is 5011954466.

It is a cyclic number.

It is not a de Polignac number, because 6644591105 - 2² = 6644591101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6644591101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48806 + ... + 125184.

It is an arithmetic number, because the mean of its divisors is an integer number (505941120).

Almost surely, 2^6644591105 is an apocalyptic number.

It is an amenable number.

6644591105 is a deficient number, since it is larger than the sum of its proper divisors (1450466815).

6644591105 is a wasteful number, since it uses less digits than its factorization.

6644591105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76648.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 6644591105 is about 81514.3613420359. The cubic root of 6644591105 is about 1879.9923706685.

The spelling of 6644591105 in words is "six billion, six hundred forty-four million, five hundred ninety-one thousand, one hundred five".