22555887581 has 2 divisors, whose sum is σ = 22555887582. Its totient is φ = 22555887580.

The previous prime is 22555887533. The next prime is 22555887611. The reversal of 22555887581 is 18578855522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20750402500 + 1805485081 = 144050^2 + 42491^2 .

It is a cyclic number.

It is not a de Polignac number, because 22555887581 - 2⁶ = 22555887517 is a prime.

It is a super-2 number, since 2×22555887581² (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 (22555884581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11277943790 + 11277943791.

It is an arithmetic number, because the mean of its divisors is an integer number (11277943791).

Almost surely, 2^22555887581 is an apocalyptic number.

It is an amenable number.

22555887581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22555887581 is an equidigital number, since it uses as much as digits as its factorization.

22555887581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960000, while the sum is 56.

The spelling of 22555887581 in words is "twenty-two billion, five hundred fifty-five million, eight hundred eighty-seven thousand, five hundred eighty-one".