25565505253 has 2 divisors, whose sum is σ = 25565505254. Its totient is φ = 25565505252.

The previous prime is 25565505211. The next prime is 25565505281. The reversal of 25565505253 is 35250556552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22747275684 + 2818229569 = 150822^2 + 53087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25565505253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25565500253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782752626 + 12782752627.

It is an arithmetic number, because the mean of its divisors is an integer number (12782752627).

Almost surely, 2^25565505253 is an apocalyptic number.

It is an amenable number.

25565505253 is a deficient number, since it is larger than the sum of its proper divisors (1).

25565505253 is an equidigital number, since it uses as much as digits as its factorization.

25565505253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1125000, while the sum is 43.

The spelling of 25565505253 in words is "twenty-five billion, five hundred sixty-five million, five hundred five thousand, two hundred fifty-three".