25680681 has 24 divisors (see below), whose sum is σ = 40354496. Its totient is φ = 15642720.

The previous prime is 25680671. The next prime is 25680691. The reversal of 25680681 is 18608652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25680671) and next prime (25680691).

It is not a de Polignac number, because 25680681 - 2⁵ = 25680649 is a prime.

It is a super-2 number, since 2×25680681² = 1318994753247522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25680671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10986 + ... + 13116.

Almost surely, 2^25680681 is an apocalyptic number.

It is an amenable number.

25680681 is a deficient number, since it is larger than the sum of its proper divisors (14673815).

25680681 is a wasteful number, since it uses less digits than its factorization.

25680681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253 (or 2250 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 25680681 is about 5067.6109755979. The cubic root of 25680681 is about 295.0318111822.

The spelling of 25680681 in words is "twenty-five million, six hundred eighty thousand, six hundred eighty-one".