22564471781 has 2 divisors, whose sum is σ = 22564471782. Its totient is φ = 22564471780.

The previous prime is 22564471771. The next prime is 22564471819. The reversal of 22564471781 is 18717446522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18119582881 + 4444888900 = 134609^2 + 66670^2 .

It is a cyclic number.

It is not a de Polignac number, because 22564471781 - 2³⁰ = 21490729957 is a prime.

It is a super-2 number, since 2×22564471781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22564471771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11282235890 + 11282235891.

It is an arithmetic number, because the mean of its divisors is an integer number (11282235891).

Almost surely, 2^22564471781 is an apocalyptic number.

It is an amenable number.

22564471781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22564471781 is an equidigital number, since it uses as much as digits as its factorization.

22564471781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 47.

The spelling of 22564471781 in words is "twenty-two billion, five hundred sixty-four million, four hundred seventy-one thousand, seven hundred eighty-one".