22081045581 has 20 divisors (see below), whose sum is σ = 37697447392. Its totient is φ = 12617740008.

The previous prime is 22081045471. The next prime is 22081045589. The reversal of 22081045581 is 18554018022.

22081045581 is a `hidden beast` number, since 2 + 20 + 8 + 10 + 45 + 581 = 666.

It is not a de Polignac number, because 22081045581 - 2¹⁸ = 22080783437 is a prime.

It is a super-2 number, since 2×22081045581² (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 (22081045589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19471255 + ... + 19472388.

Almost surely, 2^22081045581 is an apocalyptic number.

22081045581 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22081045581 is a deficient number, since it is larger than the sum of its proper divisors (15616401811).

22081045581 is an equidigital number, since it uses as much as digits as its factorization.

22081045581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38943662 (or 38943653 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The spelling of 22081045581 in words is "twenty-two billion, eighty-one million, forty-five thousand, five hundred eighty-one".