25556000017 has 2 divisors, whose sum is σ = 25556000018. Its totient is φ = 25556000016.

The previous prime is 25555999981. The next prime is 25556000033. The reversal of 25556000017 is 71000065552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14480752896 + 11075247121 = 120336^2 + 105239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25556000017 is a prime.

It is not a weakly prime, because it can be changed into another prime (25556000087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12778000008 + 12778000009.

It is an arithmetic number, because the mean of its divisors is an integer number (12778000009).

Almost surely, 2^25556000017 is an apocalyptic number.

It is an amenable number.

25556000017 is a deficient number, since it is larger than the sum of its proper divisors (1).

25556000017 is an equidigital number, since it uses as much as digits as its factorization.

25556000017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10500, while the sum is 31.

Adding to 25556000017 its reverse (71000065552), we get a palindrome (96556065569).

The spelling of 25556000017 in words is "twenty-five billion, five hundred fifty-six million, seventeen", and thus it is an aban number.