25518914425 has 6 divisors (see below), whose sum is σ = 31643453918. Its totient is φ = 20415131520.

The previous prime is 25518914423. The next prime is 25518914431. The reversal of 25518914425 is 52441981552.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8169809769 + 17349104656 = 90387^2 + 131716^2 .

It is not a de Polignac number, because 25518914425 - 2¹ = 25518914423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25518914423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510378264 + ... + 510378313.

Almost surely, 2^25518914425 is an apocalyptic number.

25518914425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25518914425 is a deficient number, since it is larger than the sum of its proper divisors (6124539493).

25518914425 is a wasteful number, since it uses less digits than its factorization.

25518914425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020756587 (or 1020756582 counting only the distinct ones).

The product of its digits is 576000, while the sum is 46.

The spelling of 25518914425 in words is "twenty-five billion, five hundred eighteen million, nine hundred fourteen thousand, four hundred twenty-five".