2580559561 has 4 divisors (see below), whose sum is σ = 2650304452. Its totient is φ = 2510814672.

The previous prime is 2580559549. The next prime is 2580559571. The reversal of 2580559561 is 1659550852.

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 2265284025 + 315275536 = 47595^2 + 17756^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2580559561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2580559571) 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, 34872390 + ... + 34872463.

It is an arithmetic number, because the mean of its divisors is an integer number (662576113).

Almost surely, 2^2580559561 is an apocalyptic number.

It is an amenable number.

2580559561 is a deficient number, since it is larger than the sum of its proper divisors (69744891).

2580559561 is an equidigital number, since it uses as much as digits as its factorization.

2580559561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69744890.

The product of its (nonzero) digits is 540000, while the sum is 46.

The square root of 2580559561 is about 50799.2082713894. The cubic root of 2580559561 is about 1371.6331175475.

The spelling of 2580559561 in words is "two billion, five hundred eighty million, five hundred fifty-nine thousand, five hundred sixty-one".