265544161 has 2 divisors, whose sum is σ = 265544162. Its totient is φ = 265544160.

The previous prime is 265544129. The next prime is 265544203. The reversal of 265544161 is 161445562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197233936 + 68310225 = 14044^2 + 8265^2 .

It is a cyclic number.

It is not a de Polignac number, because 265544161 - 2⁵ = 265544129 is a prime.

It is not a weakly prime, because it can be changed into another prime (265544861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132772080 + 132772081.

It is an arithmetic number, because the mean of its divisors is an integer number (132772081).

Almost surely, 2^265544161 is an apocalyptic number.

It is an amenable number.

265544161 is a deficient number, since it is larger than the sum of its proper divisors (1).

265544161 is an equidigital number, since it uses as much as digits as its factorization.

265544161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 265544161 is about 16295.5257969788. The cubic root of 265544161 is about 642.7551801203.

The spelling of 265544161 in words is "two hundred sixty-five million, five hundred forty-four thousand, one hundred sixty-one".