2566561713 has 4 divisors (see below), whose sum is σ = 3422082288. Its totient is φ = 1711041140.

The previous prime is 2566561687. The next prime is 2566561783. The reversal of 2566561713 is 3171656652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2566561713 - 2⁵ = 2566561681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2566561783) 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, 427760283 + ... + 427760288.

It is an arithmetic number, because the mean of its divisors is an integer number (855520572).

Almost surely, 2^2566561713 is an apocalyptic number.

It is an amenable number.

2566561713 is a deficient number, since it is larger than the sum of its proper divisors (855520575).

2566561713 is an equidigital number, since it uses as much as digits as its factorization.

2566561713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855520574.

The product of its digits is 226800, while the sum is 42.

The square root of 2566561713 is about 50661.2446846700. The cubic root of 2566561713 is about 1369.1485488473.

It can be divided in two parts, 25665 and 61713, that added together give a palindrome (87378).

The spelling of 2566561713 in words is "two billion, five hundred sixty-six million, five hundred sixty-one thousand, seven hundred thirteen".