25600661 has 8 divisors (see below), whose sum is σ = 26016000. Its totient is φ = 25187760.

The previous prime is 25600651. The next prime is 25600667. The reversal of 25600661 is 16600652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25600661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25600661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25600667) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 42440 + ... + 43038.

It is an arithmetic number, because the mean of its divisors is an integer number (3252000).

Almost surely, 2^25600661 is an apocalyptic number.

It is an amenable number.

25600661 is a deficient number, since it is larger than the sum of its proper divisors (415339).

25600661 is an equidigital number, since it uses as much as digits as its factorization.

25600661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25600661 is about 5059.7095766457. The cubic root of 25600661 is about 294.7250564786.

Subtracting from 25600661 its reverse (16600652), we obtain a palindrome (9000009).

The spelling of 25600661 in words is "twenty-five million, six hundred thousand, six hundred sixty-one".