181195823065 has 4 divisors (see below), whose sum is σ = 217434987684. Its totient is φ = 144956658448.

The previous prime is 181195823063. The next prime is 181195823071. The reversal of 181195823065 is 560328591181.

181195823065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560328591181 = 291217 ⋅1924093.

It can be written as a sum of positive squares in 2 ways, for example, as 96935086336 + 84260736729 = 311344^2 + 290277^2 .

It is a cyclic number.

It is not a de Polignac number, because 181195823065 - 2¹ = 181195823063 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181195823063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18119582302 + ... + 18119582311.

It is an arithmetic number, because the mean of its divisors is an integer number (54358746921).

Almost surely, 2^181195823065 is an apocalyptic number.

It is an amenable number.

181195823065 is a deficient number, since it is larger than the sum of its proper divisors (36239164619).

181195823065 is an equidigital number, since it uses as much as digits as its factorization.

181195823065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36239164618.

The product of its (nonzero) digits is 518400, while the sum is 49.

The spelling of 181195823065 in words is "one hundred eighty-one billion, one hundred ninety-five million, eight hundred twenty-three thousand, sixty-five".