25665850265 has 12 divisors (see below), whose sum is σ = 33853469412. Its totient is φ = 18666072480.

The previous prime is 25665850253. The next prime is 25665850291. The reversal of 25665850265 is 56205856652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3942332944 + 21723517321 = 62788^2 + 147389^2 .

It is not a de Polignac number, because 25665850265 - 2⁶ = 25665850201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21210842 + ... + 21212051.

It is an arithmetic number, because the mean of its divisors is an integer number (2821122451).

Almost surely, 2^25665850265 is an apocalyptic number.

It is an amenable number.

25665850265 is a deficient number, since it is larger than the sum of its proper divisors (8187619147).

25665850265 is a wasteful number, since it uses less digits than its factorization.

25665850265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42422920 (or 42422909 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 50.

The spelling of 25665850265 in words is "twenty-five billion, six hundred sixty-five million, eight hundred fifty thousand, two hundred sixty-five".