25934847849 has 9 divisors (see below), whose sum is σ = 37462144759. Its totient is φ = 17289576480.

The previous prime is 25934847847. The next prime is 25934847859. The reversal of 25934847849 is 94874843952.

The square root of 25934847849 is 161043.

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

25934847849 is a `hidden beast` number, since 25 + 93 + 484 + 7 + 8 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10209687849 + 15725160000 = 101043^2 + 125400^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 25934847849 - 2¹ = 25934847847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25934847847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 456289 + ... + 509969.

Almost surely, 2^25934847849 is an apocalyptic number.

25934847849 is the 161043-rd square number.

25934847849 is the 80522-nd centered octagonal number.

It is an amenable number.

25934847849 is a deficient number, since it is larger than the sum of its proper divisors (11527296910).

25934847849 is an frugal number, since it uses more digits than its factorization.

25934847849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107368 (or 53684 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 25934847849 in words is "twenty-five billion, nine hundred thirty-four million, eight hundred forty-seven thousand, eight hundred forty-nine".