25566025 has 12 divisors (see below), whose sum is σ = 31802652. Its totient is φ = 20387840.

The previous prime is 25566019. The next prime is 25566031. The reversal of 25566025 is 52066552.

It is an interprime number because it is at equal distance from previous prime (25566019) and next prime (25566031).

It can be written as a sum of positive squares in 6 ways, for example, as 4064256 + 21501769 = 2016^2 + 4637^2 .

It is not a de Polignac number, because 25566025 - 2³ = 25566017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7377 + ... + 10273.

It is an arithmetic number, because the mean of its divisors is an integer number (2650221).

Almost surely, 2^25566025 is an apocalyptic number.

25566025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25566025 is a deficient number, since it is larger than the sum of its proper divisors (6236627).

25566025 is a wasteful number, since it uses less digits than its factorization.

25566025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260 (or 3255 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 25566025 is about 5056.2856920866. The cubic root of 25566025 is about 294.5920819935.

The spelling of 25566025 in words is "twenty-five million, five hundred sixty-six thousand, twenty-five".