255561265705 has 4 divisors (see below), whose sum is σ = 306673518852. Its totient is φ = 204449012560.

The previous prime is 255561265703. The next prime is 255561265709. The reversal of 255561265705 is 507562165552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83508862441 + 172052403264 = 288979^2 + 414792^2 .

It is not a de Polignac number, because 255561265705 - 2¹ = 255561265703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255561265703) 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 in 3 ways as a sum of consecutive naturals, for example, 25556126566 + ... + 25556126575.

It is an arithmetic number, because the mean of its divisors is an integer number (76668379713).

Almost surely, 2^255561265705 is an apocalyptic number.

It is an amenable number.

255561265705 is a deficient number, since it is larger than the sum of its proper divisors (51112253147).

255561265705 is an equidigital number, since it uses as much as digits as its factorization.

255561265705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51112253146.

The product of its (nonzero) digits is 3150000, while the sum is 49.

The spelling of 255561265705 in words is "two hundred fifty-five billion, five hundred sixty-one million, two hundred sixty-five thousand, seven hundred five".