25500810449 has 4 divisors (see below), whose sum is σ = 25581254964. Its totient is φ = 25420365936.

The previous prime is 25500810443. The next prime is 25500810463. The reversal of 25500810449 is 94401800552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5547270400 + 19953540049 = 74480^2 + 141257^2 .

It is a cyclic number.

It is not a de Polignac number, because 25500810449 - 2⁸ = 25500810193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25500810443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40221782 + ... + 40222415.

It is an arithmetic number, because the mean of its divisors is an integer number (6395313741).

Almost surely, 2^25500810449 is an apocalyptic number.

It is an amenable number.

25500810449 is a deficient number, since it is larger than the sum of its proper divisors (80444515).

25500810449 is an equidigital number, since it uses as much as digits as its factorization.

25500810449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80444514.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 25500810449 in words is "twenty-five billion, five hundred million, eight hundred ten thousand, four hundred forty-nine".