2561256253 has 2 divisors, whose sum is σ = 2561256254. Its totient is φ = 2561256252.

The previous prime is 2561256251. The next prime is 2561256317. The reversal of 2561256253 is 3526521652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2548028484 + 13227769 = 50478^2 + 3637^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561256253 - 2¹ = 2561256251 is a prime.

Together with 2561256251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561256251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280628126 + 1280628127.

It is an arithmetic number, because the mean of its divisors is an integer number (1280628127).

Almost surely, 2^2561256253 is an apocalyptic number.

It is an amenable number.

2561256253 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561256253 is an equidigital number, since it uses as much as digits as its factorization.

2561256253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 37.

The square root of 2561256253 is about 50608.8554800442. The cubic root of 2561256253 is about 1368.2044876668.

The spelling of 2561256253 in words is "two billion, five hundred sixty-one million, two hundred fifty-six thousand, two hundred fifty-three".