25864275617 has 4 divisors (see below), whose sum is σ = 26756147220. Its totient is φ = 24972404016.

The previous prime is 25864275599. The next prime is 25864275623. The reversal of 25864275617 is 71657246852.

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 18538456336 + 7325819281 = 136156^2 + 85591^2 .

It is a cyclic number.

It is not a de Polignac number, because 25864275617 - 2⁶ = 25864275553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25864275667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445935758 + ... + 445935815.

It is an arithmetic number, because the mean of its divisors is an integer number (6689036805).

Almost surely, 2^25864275617 is an apocalyptic number.

It is an amenable number.

25864275617 is a deficient number, since it is larger than the sum of its proper divisors (891871603).

25864275617 is an equidigital number, since it uses as much as digits as its factorization.

25864275617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891871602.

The product of its digits is 5644800, while the sum is 53.

The spelling of 25864275617 in words is "twenty-five billion, eight hundred sixty-four million, two hundred seventy-five thousand, six hundred seventeen".