255565577 has 2 divisors, whose sum is σ = 255565578. Its totient is φ = 255565576.

The previous prime is 255565571. The next prime is 255565579. The reversal of 255565577 is 775565552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217385536 + 38180041 = 14744^2 + 6179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255565577 is a prime.

Together with 255565579, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255565571) 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, 127782788 + 127782789.

It is an arithmetic number, because the mean of its divisors is an integer number (127782789).

Almost surely, 2^255565577 is an apocalyptic number.

It is an amenable number.

255565577 is a deficient number, since it is larger than the sum of its proper divisors (1).

255565577 is an equidigital number, since it uses as much as digits as its factorization.

255565577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837500, while the sum is 47.

The square root of 255565577 is about 15986.4185169787. The cubic root of 255565577 is about 634.6010489263.

The spelling of 255565577 in words is "two hundred fifty-five million, five hundred sixty-five thousand, five hundred seventy-seven".