255965161 has 2 divisors, whose sum is σ = 255965162. Its totient is φ = 255965160.

The previous prime is 255965159. The next prime is 255965201. The reversal of 255965161 is 161569552.

It is an a-pointer prime, because the next prime (255965201) can be obtained adding 255965161 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213715161 + 42250000 = 14619^2 + 6500^2 .

It is a cyclic number.

It is not a de Polignac number, because 255965161 - 2¹ = 255965159 is a prime.

Together with 255965159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (255965261) 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, 127982580 + 127982581.

It is an arithmetic number, because the mean of its divisors is an integer number (127982581).

Almost surely, 2^255965161 is an apocalyptic number.

It is an amenable number.

255965161 is a deficient number, since it is larger than the sum of its proper divisors (1).

255965161 is an equidigital number, since it uses as much as digits as its factorization.

255965161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 40.

The square root of 255965161 is about 15998.9112442066. The cubic root of 255965161 is about 634.9316155924.

The spelling of 255965161 in words is "two hundred fifty-five million, nine hundred sixty-five thousand, one hundred sixty-one".