22247025781 has 2 divisors, whose sum is σ = 22247025782. Its totient is φ = 22247025780.

The previous prime is 22247025769. The next prime is 22247025811. The reversal of 22247025781 is 18752074222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16279463281 + 5967562500 = 127591^2 + 77250^2 .

It is a cyclic number.

It is not a de Polignac number, because 22247025781 - 2¹³ = 22247017589 is a prime.

It is a super-2 number, since 2×22247025781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22247025181) 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, 11123512890 + 11123512891.

It is an arithmetic number, because the mean of its divisors is an integer number (11123512891).

Almost surely, 2^22247025781 is an apocalyptic number.

It is an amenable number.

22247025781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22247025781 is an equidigital number, since it uses as much as digits as its factorization.

22247025781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 40.

The spelling of 22247025781 in words is "twenty-two billion, two hundred forty-seven million, twenty-five thousand, seven hundred eighty-one".