22644306665 has 4 divisors (see below), whose sum is σ = 27173168004. Its totient is φ = 18115445328.

The previous prime is 22644306577. The next prime is 22644306689. The reversal of 22644306665 is 56660344622.

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 7522439824 + 15121866841 = 86732^2 + 122971^2 .

It is a cyclic number.

It is not a de Polignac number, because 22644306665 - 2⁸ = 22644306409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2264430662 + ... + 2264430671.

It is an arithmetic number, because the mean of its divisors is an integer number (6793292001).

Almost surely, 2^22644306665 is an apocalyptic number.

It is an amenable number.

22644306665 is a deficient number, since it is larger than the sum of its proper divisors (4528861339).

22644306665 is an equidigital number, since it uses as much as digits as its factorization.

22644306665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528861338.

The product of its (nonzero) digits is 1244160, while the sum is 44.

The spelling of 22644306665 in words is "twenty-two billion, six hundred forty-four million, three hundred six thousand, six hundred sixty-five".