25405405853 has 2 divisors, whose sum is σ = 25405405854. Its totient is φ = 25405405852.

The previous prime is 25405405819. The next prime is 25405405859. The reversal of 25405405853 is 35850450452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22493400484 + 2912005369 = 149978^2 + 53963^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25405405853 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25405405853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25405405859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12702702926 + 12702702927.

It is an arithmetic number, because the mean of its divisors is an integer number (12702702927).

Almost surely, 2^25405405853 is an apocalyptic number.

It is an amenable number.

25405405853 is a deficient number, since it is larger than the sum of its proper divisors (1).

25405405853 is an equidigital number, since it uses as much as digits as its factorization.

25405405853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480000, while the sum is 41.

The spelling of 25405405853 in words is "twenty-five billion, four hundred five million, four hundred five thousand, eight hundred fifty-three".