25294675849 has 9 divisors (see below), whose sum is σ = 25596402727. Its totient is φ = 24996470224.

The previous prime is 25294675843. The next prime is 25294675883. The reversal of 25294675849 is 94857649252.

The square root of 25294675849 is 159043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4857114249 + 20437561600 = 69693^2 + 142960^2 .

It is not a de Polignac number, because 25294675849 - 2⁹ = 25294675337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25294675843) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14153934 + ... + 14155720.

Almost surely, 2^25294675849 is an apocalyptic number.

25294675849 is the 159043-rd square number.

25294675849 is the 79522-nd centered octagonal number.

It is an amenable number.

25294675849 is a deficient number, since it is larger than the sum of its proper divisors (301726878).

25294675849 is an frugal number, since it uses more digits than its factorization.

25294675849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752 (or 1876 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 61.

The spelling of 25294675849 in words is "twenty-five billion, two hundred ninety-four million, six hundred seventy-five thousand, eight hundred forty-nine".