25555268861 has 2 divisors, whose sum is σ = 25555268862. Its totient is φ = 25555268860.

The previous prime is 25555268839. The next prime is 25555268873. The reversal of 25555268861 is 16886255552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25529967961 + 25300900 = 159781^2 + 5030^2 .

It is a cyclic number.

It is not a de Polignac number, because 25555268861 - 2⁶ = 25555268797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25555267861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777634430 + 12777634431.

It is an arithmetic number, because the mean of its divisors is an integer number (12777634431).

Almost surely, 2^25555268861 is an apocalyptic number.

It is an amenable number.

25555268861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555268861 is an equidigital number, since it uses as much as digits as its factorization.

25555268861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760000, while the sum is 53.

The spelling of 25555268861 in words is "twenty-five billion, five hundred fifty-five million, two hundred sixty-eight thousand, eight hundred sixty-one".