6646991149 has 2 divisors, whose sum is σ = 6646991150. Its totient is φ = 6646991148.

The previous prime is 6646991137. The next prime is 6646991243. The reversal of 6646991149 is 9411996466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5958296100 + 688695049 = 77190^2 + 26243^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646991149 - 2²⁵ = 6613436717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6646991149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6646991119) 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, 3323495574 + 3323495575.

It is an arithmetic number, because the mean of its divisors is an integer number (3323495575).

Almost surely, 2^6646991149 is an apocalyptic number.

It is an amenable number.

6646991149 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646991149 is an equidigital number, since it uses as much as digits as its factorization.

6646991149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 55.

The square root of 6646991149 is about 81529.0816150900. The cubic root of 6646991149 is about 1880.2186961709.

The spelling of 6646991149 in words is "six billion, six hundred forty-six million, nine hundred ninety-one thousand, one hundred forty-nine".