25566943 has 4 divisors (see below), whose sum is σ = 25600960. Its totient is φ = 25532928.

The previous prime is 25566911. The next prime is 25566973. The reversal of 25566943 is 34966552.

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 25566943 - 2⁵ = 25566911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25566896 and 25566905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25566973) 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, 15855 + ... + 17392.

It is an arithmetic number, because the mean of its divisors is an integer number (6400240).

Almost surely, 2^25566943 is an apocalyptic number.

25566943 is a deficient number, since it is larger than the sum of its proper divisors (34017).

25566943 is an equidigital number, since it uses as much as digits as its factorization.

25566943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34016.

The product of its digits is 194400, while the sum is 40.

The square root of 25566943 is about 5056.3764693701. The cubic root of 25566943 is about 294.5956079267.

The spelling of 25566943 in words is "twenty-five million, five hundred sixty-six thousand, nine hundred forty-three".