255665761369 has 2 divisors, whose sum is σ = 255665761370. Its totient is φ = 255665761368.

The previous prime is 255665761367. The next prime is 255665761399. The reversal of 255665761369 is 963167566552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186831417600 + 68834343769 = 432240^2 + 262363^2 .

It is a cyclic number.

It is not a de Polignac number, because 255665761369 - 2¹ = 255665761367 is a prime.

It is a super-2 number, since 2×255665761369² (a number of 24 digits) contains 22 as substring.

Together with 255665761367, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (255665761367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127832880684 + 127832880685.

It is an arithmetic number, because the mean of its divisors is an integer number (127832880685).

Almost surely, 2^255665761369 is an apocalyptic number.

It is an amenable number.

255665761369 is a deficient number, since it is larger than the sum of its proper divisors (1).

255665761369 is an equidigital number, since it uses as much as digits as its factorization.

255665761369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236000, while the sum is 61.

The spelling of 255665761369 in words is "two hundred fifty-five billion, six hundred sixty-five million, seven hundred sixty-one thousand, three hundred sixty-nine".