25500005549 has 2 divisors, whose sum is σ = 25500005550. Its totient is φ = 25500005548.

The previous prime is 25500005527. The next prime is 25500005569. The reversal of 25500005549 is 94550000552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16407048100 + 9092957449 = 128090^2 + 95357^2 .

It is a cyclic number.

It is not a de Polignac number, because 25500005549 - 2¹² = 25500001453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25500005519) 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, 12750002774 + 12750002775.

It is an arithmetic number, because the mean of its divisors is an integer number (12750002775).

Almost surely, 2^25500005549 is an apocalyptic number.

It is an amenable number.

25500005549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25500005549 is an equidigital number, since it uses as much as digits as its factorization.

25500005549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 25500005549 in words is "twenty-five billion, five hundred million, five thousand, five hundred forty-nine".