22018814581 has 4 divisors (see below), whose sum is σ = 22320442252. Its totient is φ = 21717186912.

The previous prime is 22018814569. The next prime is 22018814593. The reversal of 22018814581 is 18541881022.

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

It is an interprime number because it is at equal distance from previous prime (22018814569) and next prime (22018814593).

It can be written as a sum of positive squares in 2 ways, for example, as 7470836356 + 14547978225 = 86434^2 + 120615^2 .

It is a cyclic number.

It is not a de Polignac number, because 22018814581 - 2⁷ = 22018814453 is a prime.

It is a super-2 number, since 2×22018814581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22018814551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150813726 + ... + 150813871.

It is an arithmetic number, because the mean of its divisors is an integer number (5580110563).

Almost surely, 2^22018814581 is an apocalyptic number.

It is an amenable number.

22018814581 is a deficient number, since it is larger than the sum of its proper divisors (301627671).

22018814581 is an equidigital number, since it uses as much as digits as its factorization.

22018814581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301627670.

The product of its (nonzero) digits is 40960, while the sum is 40.

The spelling of 22018814581 in words is "twenty-two billion, eighteen million, eight hundred fourteen thousand, five hundred eighty-one".