2561919959 has 2 divisors, whose sum is σ = 2561919960. Its totient is φ = 2561919958.

The previous prime is 2561919953. The next prime is 2561919961. The reversal of 2561919959 is 9599191652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561919959 is a prime.

Together with 2561919961, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561919953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280959979 + 1280959980.

It is an arithmetic number, because the mean of its divisors is an integer number (1280959980).

Almost surely, 2^2561919959 is an apocalyptic number.

2561919959 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561919959 is an equidigital number, since it uses as much as digits as its factorization.

2561919959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1968300, while the sum is 56.

The square root of 2561919959 is about 50615.4122674112. The cubic root of 2561919959 is about 1368.3226597681.

The spelling of 2561919959 in words is "two billion, five hundred sixty-one million, nine hundred nineteen thousand, nine hundred fifty-nine".