22320511561 has 4 divisors (see below), whose sum is σ = 22864914324. Its totient is φ = 21776108800.

The previous prime is 22320511537. The next prime is 22320511579. The reversal of 22320511561 is 16511502322.

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 12668628025 + 9651883536 = 112555^2 + 98244^2 .

It is a cyclic number.

It is not a de Polignac number, because 22320511561 - 2¹¹ = 22320509513 is a prime.

It is a super-3 number, since 3×22320511561³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22320511511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272201320 + ... + 272201401.

It is an arithmetic number, because the mean of its divisors is an integer number (5716228581).

Almost surely, 2^22320511561 is an apocalyptic number.

It is an amenable number.

22320511561 is a deficient number, since it is larger than the sum of its proper divisors (544402763).

22320511561 is an equidigital number, since it uses as much as digits as its factorization.

22320511561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544402762.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 22320511561 in words is "twenty-two billion, three hundred twenty million, five hundred eleven thousand, five hundred sixty-one".