22087744661 has 2 divisors, whose sum is σ = 22087744662. Its totient is φ = 22087744660.

The previous prime is 22087744633. The next prime is 22087744691. The reversal of 22087744661 is 16644778022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18822193636 + 3265551025 = 137194^2 + 57145^2 .

It is a cyclic number.

It is not a de Polignac number, because 22087744661 - 2³⁰ = 21014002837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22087744691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11043872330 + 11043872331.

It is an arithmetic number, because the mean of its divisors is an integer number (11043872331).

Almost surely, 2^22087744661 is an apocalyptic number.

It is an amenable number.

22087744661 is a deficient number, since it is larger than the sum of its proper divisors (1).

22087744661 is an equidigital number, since it uses as much as digits as its factorization.

22087744661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 22087744661 in words is "twenty-two billion, eighty-seven million, seven hundred forty-four thousand, six hundred sixty-one".