22065566321 has 4 divisors (see below), whose sum is σ = 22136063652. Its totient is φ = 21995068992.

The previous prime is 22065566269. The next prime is 22065566323. The reversal of 22065566321 is 12366556022.

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 3406006321 + 18659560000 = 58361^2 + 136600^2 .

It is a cyclic number.

It is not a de Polignac number, because 22065566321 - 2¹⁰ = 22065565297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22065566323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35248196 + ... + 35248821.

It is an arithmetic number, because the mean of its divisors is an integer number (5534015913).

Almost surely, 2^22065566321 is an apocalyptic number.

It is an amenable number.

22065566321 is a deficient number, since it is larger than the sum of its proper divisors (70497331).

22065566321 is an equidigital number, since it uses as much as digits as its factorization.

22065566321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70497330.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 22065566321 in words is "twenty-two billion, sixty-five million, five hundred sixty-six thousand, three hundred twenty-one".