2725810561 has 4 divisors (see below), whose sum is σ = 2772010800. Its totient is φ = 2679610324.

The previous prime is 2725810537. The next prime is 2725810567. The reversal of 2725810561 is 1650185272.

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 2725810561 - 2⁹ = 2725810049 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2725810561.

It is not an unprimeable number, because it can be changed into a prime (2725810567) 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, 23100031 + ... + 23100148.

It is an arithmetic number, because the mean of its divisors is an integer number (693002700).

Almost surely, 2^2725810561 is an apocalyptic number.

It is an amenable number.

2725810561 is a deficient number, since it is larger than the sum of its proper divisors (46200239).

2725810561 is an equidigital number, since it uses as much as digits as its factorization.

2725810561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46200238.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 2725810561 is about 52209.2957336143. The cubic root of 2725810561 is about 1396.8996974355.

The spelling of 2725810561 in words is "two billion, seven hundred twenty-five million, eight hundred ten thousand, five hundred sixty-one".