2561245244171 has 16 divisors (see below), whose sum is σ = 2701460367360. Its totient is φ = 2423576686080.

The previous prime is 2561245244059. The next prime is 2561245244179. The reversal of 2561245244171 is 1714425421652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561245244171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561245244179) 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, 817115 + ... + 2406276.

It is an arithmetic number, because the mean of its divisors is an integer number (168841272960).

Almost surely, 2^{2561245244171} is an apocalyptic number.

2561245244171 is a deficient number, since it is larger than the sum of its proper divisors (140215123189).

2561245244171 is a wasteful number, since it uses less digits than its factorization.

2561245244171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223786.

The product of its digits is 537600, while the sum is 44.

The spelling of 2561245244171 in words is "two trillion, five hundred sixty-one billion, two hundred forty-five million, two hundred forty-four thousand, one hundred seventy-one".