25966861 has 8 divisors (see below), whose sum is σ = 26952120. Its totient is φ = 24987648.

The previous prime is 25966849. The next prime is 25966879. The reversal of 25966861 is 16866952.

It can be written as a sum of positive squares in 4 ways, for example, as 3261636 + 22705225 = 1806^2 + 4765^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25966861 - 2⁹ = 25966349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25966841) 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, 8445 + ... + 11101.

It is an arithmetic number, because the mean of its divisors is an integer number (3369015).

Almost surely, 2^25966861 is an apocalyptic number.

It is an amenable number.

25966861 is a deficient number, since it is larger than the sum of its proper divisors (985259).

25966861 is a wasteful number, since it uses less digits than its factorization.

25966861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023.

The product of its digits is 155520, while the sum is 43.

The square root of 25966861 is about 5095.7689311820. The cubic root of 25966861 is about 296.1236890241.

Subtracting from 25966861 its reverse (16866952), we obtain a palindrome (9099909).

The spelling of 25966861 in words is "twenty-five million, nine hundred sixty-six thousand, eight hundred sixty-one".