2560506161 has 4 divisors (see below), whose sum is σ = 2608817652. Its totient is φ = 2512194672.

The previous prime is 2560506089. The next prime is 2560506181. The reversal of 2560506161 is 1616050652.

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 2290101025 + 270405136 = 47855^2 + 16444^2 .

It is a cyclic number.

It is not a de Polignac number, because 2560506161 - 2¹⁰ = 2560505137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2560506181) 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, 24155666 + ... + 24155771.

It is an arithmetic number, because the mean of its divisors is an integer number (652204413).

Almost surely, 2^2560506161 is an apocalyptic number.

It is an amenable number.

2560506161 is a deficient number, since it is larger than the sum of its proper divisors (48311491).

2560506161 is an equidigital number, since it uses as much as digits as its factorization.

2560506161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48311490.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 2560506161 is about 50601.4442580447. Note that the first 3 decimals coincide. The cubic root of 2560506161 is about 1368.0709100599.

The spelling of 2560506161 in words is "two billion, five hundred sixty million, five hundred six thousand, one hundred sixty-one".