25996681 has 4 divisors (see below), whose sum is σ = 26699332. Its totient is φ = 25294032.

The previous prime is 25996669. The next prime is 25996699. The reversal of 25996681 is 18669952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22325625 + 3671056 = 4725^2 + 1916^2 .

It is a cyclic number.

It is not a de Polignac number, because 25996681 - 2⁹ = 25996169 is a prime.

It is a super-2 number, since 2×25996681² = 1351654846031522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25991681) 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, 351270 + ... + 351343.

It is an arithmetic number, because the mean of its divisors is an integer number (6674833).

Almost surely, 2^25996681 is an apocalyptic number.

It is an amenable number.

25996681 is a deficient number, since it is larger than the sum of its proper divisors (702651).

25996681 is an equidigital number, since it uses as much as digits as its factorization.

25996681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702650.

The product of its digits is 233280, while the sum is 46.

The square root of 25996681 is about 5098.6940484795. The cubic root of 25996681 is about 296.2370005037.

The spelling of 25996681 in words is "twenty-five million, nine hundred ninety-six thousand, six hundred eighty-one".