25278256025 has 48 divisors (see below), whose sum is σ = 34912944000. Its totient is φ = 18001536000.

The previous prime is 25278256021. The next prime is 25278256027. The reversal of 25278256025 is 52065287252.

It is not a de Polignac number, because 25278256025 - 2² = 25278256021 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25278256021) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 2904881 + ... + 2913569.

It is an arithmetic number, because the mean of its divisors is an integer number (727353000).

Almost surely, 2^25278256025 is an apocalyptic number.

25278256025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25278256025 is a deficient number, since it is larger than the sum of its proper divisors (9634687975).

25278256025 is a wasteful number, since it uses less digits than its factorization.

25278256025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8930 (or 8925 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 44.

The spelling of 25278256025 in words is "twenty-five billion, two hundred seventy-eight million, two hundred fifty-six thousand, twenty-five".