25781245065 has 24 divisors (see below), whose sum is σ = 47039466240. Its totient is φ = 13026312864.

The previous prime is 25781245057. The next prime is 25781245067. The reversal of 25781245065 is 56054218752.

25781245065 is a `hidden beast` number, since 2 + 578 + 1 + 24 + 50 + 6 + 5 = 666.

It is not a de Polignac number, because 25781245065 - 2³ = 25781245057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 25781245065.

It is not an unprimeable number, because it can be changed into a prime (25781245067) 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 23 ways as a sum of consecutive naturals, for example, 15075897 + ... + 15077606.

It is an arithmetic number, because the mean of its divisors is an integer number (1959977760).

Almost surely, 2^25781245065 is an apocalyptic number.

It is an amenable number.

25781245065 is a deficient number, since it is larger than the sum of its proper divisors (21258221175).

25781245065 is a wasteful number, since it uses less digits than its factorization.

25781245065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30153533 (or 30153530 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 25781245065 in words is "twenty-five billion, seven hundred eighty-one million, two hundred forty-five thousand, sixty-five".