6661326869 has 24 divisors (see below), whose sum is σ = 7546406040. Its totient is φ = 5857754112.

The previous prime is 6661326839. The next prime is 6661326877. The reversal of 6661326869 is 9686231666.

It can be written as a sum of positive squares in 4 ways, for example, as 1176147025 + 5485179844 = 34295^2 + 74062^2 .

It is not a de Polignac number, because 6661326869 - 2¹⁶ = 6661261333 is a prime.

It is a super-2 number, since 2×6661326869² = 88746551311322686322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6661326869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661326829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 440567 + ... + 455435.

It is an arithmetic number, because the mean of its divisors is an integer number (314433585).

Almost surely, 2^6661326869 is an apocalyptic number.

It is an amenable number.

6661326869 is a deficient number, since it is larger than the sum of its proper divisors (885079171).

6661326869 is a wasteful number, since it uses less digits than its factorization.

6661326869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14997 (or 14978 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 53.

The square root of 6661326869 is about 81616.9520932998. The cubic root of 6661326869 is about 1881.5694293423.

The spelling of 6661326869 in words is "six billion, six hundred sixty-one million, three hundred twenty-six thousand, eight hundred sixty-nine".