25117512145 has 12 divisors (see below), whose sum is σ = 33130206900. Its totient is φ = 18267281120.

The previous prime is 25117512131. The next prime is 25117512169. The reversal of 25117512145 is 54121571152.

It can be written as a sum of positive squares in 2 ways, for example, as 9982607569 + 15134904576 = 99913^2 + 123024^2 .

It is not a de Polignac number, because 25117512145 - 2⁵ = 25117512113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25117512145.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 20757670 + ... + 20758879.

It is an arithmetic number, because the mean of its divisors is an integer number (2760850575).

Almost surely, 2^25117512145 is an apocalyptic number.

It is an amenable number.

25117512145 is a deficient number, since it is larger than the sum of its proper divisors (8012694755).

25117512145 is a wasteful number, since it uses less digits than its factorization.

25117512145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41516576 (or 41516565 counting only the distinct ones).

The product of its digits is 14000, while the sum is 34.

The spelling of 25117512145 in words is "twenty-five billion, one hundred seventeen million, five hundred twelve thousand, one hundred forty-five".