25175821249 has 2 divisors, whose sum is σ = 25175821250. Its totient is φ = 25175821248.

The previous prime is 25175821219. The next prime is 25175821283. The reversal of 25175821249 is 94212857152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24275821249 + 900000000 = 155807^2 + 30000^2 .

It is a cyclic number.

It is not a de Polignac number, because 25175821249 - 2⁹ = 25175820737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25175821199 and 25175821208.

It is not a weakly prime, because it can be changed into another prime (25175821219) 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, 12587910624 + 12587910625.

It is an arithmetic number, because the mean of its divisors is an integer number (12587910625).

Almost surely, 2^25175821249 is an apocalyptic number.

It is an amenable number.

25175821249 is a deficient number, since it is larger than the sum of its proper divisors (1).

25175821249 is an equidigital number, since it uses as much as digits as its factorization.

25175821249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 46.

The spelling of 25175821249 in words is "twenty-five billion, one hundred seventy-five million, eight hundred twenty-one thousand, two hundred forty-nine".