25509928625 has 8 divisors (see below), whose sum is σ = 31836391080. Its totient is φ = 20407942800.

The previous prime is 25509928603. The next prime is 25509928657. The reversal of 25509928625 is 52682990552.

It can be written as a sum of positive squares in 4 ways, for example, as 3532162624 + 21977766001 = 59432^2 + 148249^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25509928625 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102039590 + ... + 102039839.

It is an arithmetic number, because the mean of its divisors is an integer number (3979548885).

Almost surely, 2^25509928625 is an apocalyptic number.

25509928625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25509928625 is a deficient number, since it is larger than the sum of its proper divisors (6326462455).

25509928625 is an equidigital number, since it uses as much as digits as its factorization.

25509928625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204079444 (or 204079434 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 53.

The spelling of 25509928625 in words is "twenty-five billion, five hundred nine million, nine hundred twenty-eight thousand, six hundred twenty-five".