6681171109 has 4 divisors (see below), whose sum is σ = 6747321420. Its totient is φ = 6615020800.

The previous prime is 6681171103. The next prime is 6681171127. The reversal of 6681171109 is 9011711866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4823302500 + 1857868609 = 69450^2 + 43103^2 .

It is a cyclic number.

It is not a de Polignac number, because 6681171109 - 2¹⁹ = 6680646821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681171103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33075004 + ... + 33075205.

It is an arithmetic number, because the mean of its divisors is an integer number (1686830355).

Almost surely, 2^6681171109 is an apocalyptic number.

It is an amenable number.

6681171109 is a deficient number, since it is larger than the sum of its proper divisors (66150311).

6681171109 is a wasteful number, since it uses less digits than its factorization.

6681171109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66150310.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 6681171109 is about 81738.4310407289. The cubic root of 6681171109 is about 1883.4359893679.

The spelling of 6681171109 in words is "six billion, six hundred eighty-one million, one hundred seventy-one thousand, one hundred nine".