6686169361 has 3 divisors (see below), whose sum is σ = 6686251131. Its totient is φ = 6686087592.

The previous prime is 6686169349. The next prime is 6686169379. The reversal of 6686169361 is 1639616866.

The square root of 6686169361 is 81769.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 934463761 + 5751705600 = 30569^2 + 75840^2 .

It is not a de Polignac number, because 6686169361 - 2²⁷ = 6551951633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6686169299 and 6686169308.

It is not an unprimeable number, because it can be changed into a prime (6686169961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 40885 + ... + 122653.

It is an arithmetic number, because the mean of its divisors is an integer number (2228750377).

Almost surely, 2^6686169361 is an apocalyptic number.

6686169361 is the 81769-th square number.

6686169361 is the 40885-th centered octagonal number.

It is an amenable number.

6686169361 is a deficient number, since it is larger than the sum of its proper divisors (81770).

6686169361 is an frugal number, since it uses more digits than its factorization.

6686169361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163538 (or 81769 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 52.

The cubic root of 6686169361 is about 1883.9055448286.

The spelling of 6686169361 in words is "six billion, six hundred eighty-six million, one hundred sixty-nine thousand, three hundred sixty-one".