22605518281 has 4 divisors (see below), whose sum is σ = 22642156692. Its totient is φ = 22568879872.

The previous prime is 22605518249. The next prime is 22605518291. The reversal of 22605518281 is 18281550622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18281550622 = 2 ⋅9140775311.

It can be written as a sum of positive squares in 2 ways, for example, as 6166175625 + 16439342656 = 78525^2 + 128216^2 .

It is a cyclic number.

It is not a de Polignac number, because 22605518281 - 2⁵ = 22605518249 is a prime.

It is a super-2 number, since 2×22605518281² (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 (22605518291) 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 in 3 ways as a sum of consecutive naturals, for example, 18318280 + ... + 18319513.

It is an arithmetic number, because the mean of its divisors is an integer number (5660539173).

Almost surely, 2^22605518281 is an apocalyptic number.

It is an amenable number.

22605518281 is a deficient number, since it is larger than the sum of its proper divisors (36638411).

22605518281 is an equidigital number, since it uses as much as digits as its factorization.

22605518281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36638410.

The product of its (nonzero) digits is 76800, while the sum is 40.

The spelling of 22605518281 in words is "twenty-two billion, six hundred five million, five hundred eighteen thousand, two hundred eighty-one".