181544283128881 has 2 divisors, whose sum is σ = 181544283128882. Its totient is φ = 181544283128880.

The previous prime is 181544283128861. The next prime is 181544283128909. The reversal of 181544283128881 is 188821382445181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104322527545600 + 77221755583281 = 10213840^2 + 8787591^2 .

It is a cyclic number.

It is not a de Polignac number, because 181544283128881 - 2⁵ = 181544283128849 is a prime.

It is a super-2 number, since 2×181544283128881² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181544283128861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90772141564440 + 90772141564441.

It is an arithmetic number, because the mean of its divisors is an integer number (90772141564441).

Almost surely, 2^{181544283128881} is an apocalyptic number.

It is an amenable number.

181544283128881 is a deficient number, since it is larger than the sum of its proper divisors (1).

181544283128881 is an equidigital number, since it uses as much as digits as its factorization.

181544283128881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31457280, while the sum is 64.

The spelling of 181544283128881 in words is "one hundred eighty-one trillion, five hundred forty-four billion, two hundred eighty-three million, one hundred twenty-eight thousand, eight hundred eighty-one".