6671791109 has 2 divisors, whose sum is σ = 6671791110. Its totient is φ = 6671791108.

The previous prime is 6671791099. The next prime is 6671791121. The reversal of 6671791109 is 9011971766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6642739009 + 29052100 = 81503^2 + 5390^2 .

It is a cyclic number.

It is not a de Polignac number, because 6671791109 - 2¹² = 6671787013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6671791129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335895554 + 3335895555.

It is an arithmetic number, because the mean of its divisors is an integer number (3335895555).

Almost surely, 2^6671791109 is an apocalyptic number.

It is an amenable number.

6671791109 is a deficient number, since it is larger than the sum of its proper divisors (1).

6671791109 is an equidigital number, since it uses as much as digits as its factorization.

6671791109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 6671791109 is about 81681.0327371049. The cubic root of 6671791109 is about 1882.5541627435.

The spelling of 6671791109 in words is "six billion, six hundred seventy-one million, seven hundred ninety-one thousand, one hundred nine".