265168861 has 2 divisors, whose sum is σ = 265168862. Its totient is φ = 265168860.

The previous prime is 265168859. The next prime is 265168903. The reversal of 265168861 is 168861562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190605636 + 74563225 = 13806^2 + 8635^2 .

It is a cyclic number.

It is not a de Polignac number, because 265168861 - 2¹ = 265168859 is a prime.

Together with 265168859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265168811) 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 as a sum of consecutive naturals, namely, 132584430 + 132584431.

It is an arithmetic number, because the mean of its divisors is an integer number (132584431).

Almost surely, 2^265168861 is an apocalyptic number.

It is an amenable number.

265168861 is a deficient number, since it is larger than the sum of its proper divisors (1).

265168861 is an equidigital number, since it uses as much as digits as its factorization.

265168861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 43.

The square root of 265168861 is about 16284.0062945210. The cubic root of 265168861 is about 642.4522301941.

The spelling of 265168861 in words is "two hundred sixty-five million, one hundred sixty-eight thousand, eight hundred sixty-one".