260785561 has 4 divisors (see below), whose sum is σ = 261485092. Its totient is φ = 260086032.

The previous prime is 260785517. The next prime is 260785571. The reversal of 260785561 is 165587062.

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 66015625 + 194769936 = 8125^2 + 13956^2 .

It is a cyclic number.

It is not a de Polignac number, because 260785561 - 2¹¹ = 260783513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260785571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349206 + ... + 349951.

It is an arithmetic number, because the mean of its divisors is an integer number (65371273).

Almost surely, 2^260785561 is an apocalyptic number.

It is an amenable number.

260785561 is a deficient number, since it is larger than the sum of its proper divisors (699531).

260785561 is an equidigital number, since it uses as much as digits as its factorization.

260785561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699530.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 260785561 is about 16148.8563372147. The cubic root of 260785561 is about 638.8925844149.

The spelling of 260785561 in words is "two hundred sixty million, seven hundred eighty-five thousand, five hundred sixty-one".