8205665 has 8 divisors (see below), whose sum is σ = 10604328. Its totient is φ = 6059520.

The previous prime is 8205653. The next prime is 8205667. The reversal of 8205665 is 5665028.

It is a happy number.

8205665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 179776 + 8025889 = 424^2 + 2833^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8205665 - 2⁸ = 8205409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8205667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63056 + ... + 63185.

It is an arithmetic number, because the mean of its divisors is an integer number (1325541).

Almost surely, 2^8205665 is an apocalyptic number.

It is an amenable number.

8205665 is a deficient number, since it is larger than the sum of its proper divisors (2398663).

8205665 is a wasteful number, since it uses less digits than its factorization.

8205665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126259.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 8205665 is about 2864.5531937808. The cubic root of 8205665 is about 201.6993943955.

The spelling of 8205665 in words is "eight million, two hundred five thousand, six hundred sixty-five".