22566266521 has 4 divisors (see below), whose sum is σ = 22611490000. Its totient is φ = 22521043044.

The previous prime is 22566266501. The next prime is 22566266549. The reversal of 22566266521 is 12566266522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22566266521 - 2¹¹ = 22566264473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22566266501) 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, 22610991 + ... + 22611988.

It is an arithmetic number, because the mean of its divisors is an integer number (5652872500).

Almost surely, 2^22566266521 is an apocalyptic number.

It is an amenable number.

22566266521 is a deficient number, since it is larger than the sum of its proper divisors (45223479).

22566266521 is an equidigital number, since it uses as much as digits as its factorization.

22566266521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45223478.

The product of its digits is 518400, while the sum is 43.

Subtracting from 22566266521 its reverse (12566266522), we obtain a palindrome (9999999999).

The spelling of 22566266521 in words is "twenty-two billion, five hundred sixty-six million, two hundred sixty-six thousand, five hundred twenty-one".