22587747781 has 2 divisors, whose sum is σ = 22587747782. Its totient is φ = 22587747780.

The previous prime is 22587747779. The next prime is 22587747841. The reversal of 22587747781 is 18774778522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13215571681 + 9372176100 = 114959^2 + 96810^2 .

It is a cyclic number.

It is not a de Polignac number, because 22587747781 - 2¹ = 22587747779 is a prime.

It is a super-2 number, since 2×22587747781² (a number of 22 digits) contains 22 as substring.

Together with 22587747779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22581747781) 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, 11293873890 + 11293873891.

It is an arithmetic number, because the mean of its divisors is an integer number (11293873891).

Almost surely, 2^22587747781 is an apocalyptic number.

It is an amenable number.

22587747781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22587747781 is an equidigital number, since it uses as much as digits as its factorization.

22587747781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12293120, while the sum is 58.

The spelling of 22587747781 in words is "twenty-two billion, five hundred eighty-seven million, seven hundred forty-seven thousand, seven hundred eighty-one".