25661425 has 6 divisors (see below), whose sum is σ = 31820198. Its totient is φ = 20529120.

The previous prime is 25661407. The next prime is 25661429. The reversal of 25661425 is 52416652.

It can be written as a sum of positive squares in 3 ways, for example, as 350464 + 25310961 = 592^2 + 5031^2 .

It is not a de Polignac number, because 25661425 - 2¹¹ = 25659377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25661429) 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, 513204 + ... + 513253.

Almost surely, 2^25661425 is an apocalyptic number.

25661425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25661425 is a deficient number, since it is larger than the sum of its proper divisors (6158773).

25661425 is a wasteful number, since it uses less digits than its factorization.

25661425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026467 (or 1026462 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 25661425 is about 5065.7107102558. The cubic root of 25661425 is about 294.9580520647.

The spelling of 25661425 in words is "twenty-five million, six hundred sixty-one thousand, four hundred twenty-five".