22539998081 has 4 divisors (see below), whose sum is σ = 22848765252. Its totient is φ = 22231230912.

The previous prime is 22539998059. The next prime is 22539998113. The reversal of 22539998081 is 18089993522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11354820481 + 11185177600 = 106559^2 + 105760^2 .

It is a cyclic number.

It is not a de Polignac number, because 22539998081 - 2¹⁰ = 22539997057 is a prime.

It is a super-2 number, since 2×22539998081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22539938081) 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 in 3 ways as a sum of consecutive naturals, for example, 154383476 + ... + 154383621.

It is an arithmetic number, because the mean of its divisors is an integer number (5712191313).

Almost surely, 2^22539998081 is an apocalyptic number.

It is an amenable number.

22539998081 is a deficient number, since it is larger than the sum of its proper divisors (308767171).

22539998081 is an equidigital number, since it uses as much as digits as its factorization.

22539998081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308767170.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 22539998081 in words is "twenty-two billion, five hundred thirty-nine million, nine hundred ninety-eight thousand, eighty-one".