25600643 has 4 divisors (see below), whose sum is σ = 26083728. Its totient is φ = 25117560.

The previous prime is 25600639. The next prime is 25600651. The reversal of 25600643 is 34600652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25600643 - 2² = 25600639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25600613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241463 + ... + 241568.

It is an arithmetic number, because the mean of its divisors is an integer number (6520932).

Almost surely, 2^25600643 is an apocalyptic number.

25600643 is a deficient number, since it is larger than the sum of its proper divisors (483085).

25600643 is an equidigital number, since it uses as much as digits as its factorization.

25600643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483084.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 25600643 is about 5059.7077978871. The cubic root of 25600643 is about 294.7249874042.

Subtracting 25600643 from its reverse (34600652), we obtain a palindrome (9000009).

The spelling of 25600643 in words is "twenty-five million, six hundred thousand, six hundred forty-three".