22206665 has 8 divisors (see below), whose sum is σ = 28697928. Its totient is φ = 16398720.

The previous prime is 22206643. The next prime is 22206671. The reversal of 22206665 is 56660222.

It can be written as a sum of positive squares in 4 ways, for example, as 3083536 + 19123129 = 1756^2 + 4373^2 .

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

It is not a de Polignac number, because 22206665 - 2⁶ = 22206601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170756 + ... + 170885.

It is an arithmetic number, because the mean of its divisors is an integer number (3587241).

Almost surely, 2^22206665 is an apocalyptic number.

It is an amenable number.

22206665 is a deficient number, since it is larger than the sum of its proper divisors (6491263).

22206665 is a wasteful number, since it uses less digits than its factorization.

22206665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341659.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 22206665 is about 4712.3948264126. The cubic root of 22206665 is about 281.0785991043.

Adding to 22206665 its reverse (56660222), we get a palindrome (78866887).

The spelling of 22206665 in words is "twenty-two million, two hundred six thousand, six hundred sixty-five".