2559185561 has 4 divisors (see below), whose sum is σ = 2559286800. Its totient is φ = 2559084324.

The previous prime is 2559185537. The next prime is 2559185567. The reversal of 2559185561 is 1655819552.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2559185561 - 2³⁰ = 1485443737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2559185567) 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, 22670 + ... + 75048.

It is an arithmetic number, because the mean of its divisors is an integer number (639821700).

Almost surely, 2^2559185561 is an apocalyptic number.

It is an amenable number.

2559185561 is a deficient number, since it is larger than the sum of its proper divisors (101239).

2559185561 is an equidigital number, since it uses as much as digits as its factorization.

2559185561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101238.

The product of its digits is 540000, while the sum is 47.

The square root of 2559185561 is about 50588.3935404160. The cubic root of 2559185561 is about 1367.8356720482.

The spelling of 2559185561 in words is "two billion, five hundred fifty-nine million, one hundred eighty-five thousand, five hundred sixty-one".