22611665 has 4 divisors (see below), whose sum is σ = 27134004. Its totient is φ = 18089328.

The previous prime is 22611637. The next prime is 22611671. The reversal of 22611665 is 56611622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56611622 = 2 ⋅28305811.

It can be written as a sum of positive squares in 2 ways, for example, as 2835856 + 19775809 = 1684^2 + 4447^2 .

It is a cyclic number.

It is not a de Polignac number, because 22611665 - 2⁶ = 22611601 is a prime.

It is a super-2 number, since 2×22611665² = 1022574788144450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2261162 + ... + 2261171.

It is an arithmetic number, because the mean of its divisors is an integer number (6783501).

Almost surely, 2^22611665 is an apocalyptic number.

It is an amenable number.

22611665 is a deficient number, since it is larger than the sum of its proper divisors (4522339).

22611665 is an equidigital number, since it uses as much as digits as its factorization.

22611665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522338.

The product of its digits is 4320, while the sum is 29.

The square root of 22611665 is about 4755.1724469256. The cubic root of 22611665 is about 282.7770639137. Note that the first 3 decimals are identical.

The spelling of 22611665 in words is "twenty-two million, six hundred eleven thousand, six hundred sixty-five".