22041556561 has 2 divisors, whose sum is σ = 22041556562. Its totient is φ = 22041556560.

The previous prime is 22041556549. The next prime is 22041556661. The reversal of 22041556561 is 16565514022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19615403025 + 2426153536 = 140055^2 + 49256^2 .

It is a cyclic number.

It is not a de Polignac number, because 22041556561 - 2⁵ = 22041556529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22041556561.

It is not a weakly prime, because it can be changed into another prime (22041556531) 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 as a sum of consecutive naturals, namely, 11020778280 + 11020778281.

It is an arithmetic number, because the mean of its divisors is an integer number (11020778281).

Almost surely, 2^22041556561 is an apocalyptic number.

It is an amenable number.

22041556561 is a deficient number, since it is larger than the sum of its proper divisors (1).

22041556561 is an equidigital number, since it uses as much as digits as its factorization.

22041556561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 22041556561 in words is "twenty-two billion, forty-one million, five hundred fifty-six thousand, five hundred sixty-one".