181445544173 has 2 divisors, whose sum is σ = 181445544174. Its totient is φ = 181445544172.

The previous prime is 181445544167. The next prime is 181445544229. The reversal of 181445544173 is 371445544181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99097780804 + 82347763369 = 314798^2 + 286963^2 .

It is a cyclic number.

It is not a de Polignac number, because 181445544173 - 2⁶ = 181445544109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181445544373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90722772086 + 90722772087.

It is an arithmetic number, because the mean of its divisors is an integer number (90722772087).

Almost surely, 2^181445544173 is an apocalyptic number.

It is an amenable number.

181445544173 is a deficient number, since it is larger than the sum of its proper divisors (1).

181445544173 is an equidigital number, since it uses as much as digits as its factorization.

181445544173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1075200, while the sum is 47.

The spelling of 181445544173 in words is "one hundred eighty-one billion, four hundred forty-five million, five hundred forty-four thousand, one hundred seventy-three".