2561726559 has 16 divisors (see below), whose sum is σ = 3906482688. Its totient is φ = 1462756512.

The previous prime is 2561726533. The next prime is 2561726579. The reversal of 2561726559 is 9556271652.

2561726559 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561726559 - 2¹¹ = 2561724511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561726579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15912 + ... + 73325.

It is an arithmetic number, because the mean of its divisors is an integer number (244155168).

Almost surely, 2^2561726559 is an apocalyptic number.

2561726559 is a deficient number, since it is larger than the sum of its proper divisors (1344756129).

2561726559 is a wasteful number, since it uses less digits than its factorization.

2561726559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90614.

The product of its digits is 1134000, while the sum is 48.

The square root of 2561726559 is about 50613.5017460756. The cubic root of 2561726559 is about 1368.2882272246.

The spelling of 2561726559 in words is "two billion, five hundred sixty-one million, seven hundred twenty-six thousand, five hundred fifty-nine".