8205443689 has 4 divisors (see below), whose sum is σ = 8216226900. Its totient is φ = 8194660480.

The previous prime is 8205443677. The next prime is 8205443707. The reversal of 8205443689 is 9863445028.

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 2663385664 + 5542058025 = 51608^2 + 74445^2 .

It is a cyclic number.

It is not a de Polignac number, because 8205443689 - 2¹⁵ = 8205410921 is a prime.

It is a super-2 number, since 2×8205443689² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8205443789) 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, 5390464 + ... + 5391985.

It is an arithmetic number, because the mean of its divisors is an integer number (2054056725).

Almost surely, 2^8205443689 is an apocalyptic number.

It is an amenable number.

8205443689 is a deficient number, since it is larger than the sum of its proper divisors (10783211).

8205443689 is a wasteful number, since it uses less digits than its factorization.

8205443689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10783210.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The square root of 8205443689 is about 90583.9041386493. The cubic root of 8205443689 is about 2016.9758106712.

The spelling of 8205443689 in words is "eight billion, two hundred five million, four hundred forty-three thousand, six hundred eighty-nine".