261085060609 has 4 divisors (see below), whose sum is σ = 261086093316. Its totient is φ = 261084027904.

The previous prime is 261085060573. The next prime is 261085060637. The reversal of 261085060609 is 906060580162.

261085060609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 97201779984 + 163883280625 = 311772^2 + 404825^2 .

It is a cyclic number.

It is not a de Polignac number, because 261085060609 - 2²⁹ = 260548189697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261085060009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146577 + ... + 737329.

It is an arithmetic number, because the mean of its divisors is an integer number (65271523329).

Almost surely, 2^261085060609 is an apocalyptic number.

It is an amenable number.

261085060609 is a deficient number, since it is larger than the sum of its proper divisors (1032707).

261085060609 is an equidigital number, since it uses as much as digits as its factorization.

261085060609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032706.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 261085060609 in words is "two hundred sixty-one billion, eighty-five million, sixty thousand, six hundred nine".