25055507809 has 2 divisors, whose sum is σ = 25055507810. Its totient is φ = 25055507808.

The previous prime is 25055507717. The next prime is 25055507831. The reversal of 25055507809 is 90870555052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14233683025 + 10821824784 = 119305^2 + 104028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25055507809 is a prime.

It is not a weakly prime, because it can be changed into another prime (25055507849) 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, 12527753904 + 12527753905.

It is an arithmetic number, because the mean of its divisors is an integer number (12527753905).

Almost surely, 2^25055507809 is an apocalyptic number.

It is an amenable number.

25055507809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25055507809 is an equidigital number, since it uses as much as digits as its factorization.

25055507809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630000, while the sum is 46.

The spelling of 25055507809 in words is "twenty-five billion, fifty-five million, five hundred seven thousand, eight hundred nine".