181445544181 has 8 divisors (see below), whose sum is σ = 198439189344. Its totient is φ = 164534998320.

The previous prime is 181445544173. The next prime is 181445544229.

181445544181 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 181445544181 - 2³ = 181445544173 is a prime.

It is a super-2 number, since 2×181445544181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181445544121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20770255 + ... + 20778988.

It is an arithmetic number, because the mean of its divisors is an integer number (24804898668).

Almost surely, 2^181445544181 is an apocalyptic number.

181445544181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

181445544181 is a deficient number, since it is larger than the sum of its proper divisors (16993645163).

181445544181 is a wasteful number, since it uses less digits than its factorization.

181445544181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41549651.

The product of its digits is 409600, while the sum is 46.

The spelling of 181445544181 in words is "one hundred eighty-one billion, four hundred forty-five million, five hundred forty-four thousand, one hundred eighty-one".