22163120561 has 4 divisors (see below), whose sum is σ = 22304287092. Its totient is φ = 22021954032.

The previous prime is 22163120557. The next prime is 22163120641. The reversal of 22163120561 is 16502136122.

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 12236784400 + 9926336161 = 110620^2 + 99631^2 .

It is a cyclic number.

It is not a de Polignac number, because 22163120561 - 2² = 22163120557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22163120521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70583030 + ... + 70583343.

It is an arithmetic number, because the mean of its divisors is an integer number (5576071773).

Almost surely, 2^22163120561 is an apocalyptic number.

It is an amenable number.

22163120561 is a deficient number, since it is larger than the sum of its proper divisors (141166531).

22163120561 is a wasteful number, since it uses less digits than its factorization.

22163120561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141166530.

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

Adding to 22163120561 its reverse (16502136122), we get a palindrome (38665256683).

The spelling of 22163120561 in words is "twenty-two billion, one hundred sixty-three million, one hundred twenty thousand, five hundred sixty-one".