25661168 has 40 divisors (see below), whose sum is σ = 54090288. Its totient is φ = 11722752.

The previous prime is 25661147. The next prime is 25661189. The reversal of 25661168 is 86116652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25661147) and next prime (25661189).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21680 + ... + 22832.

Almost surely, 2^25661168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25661168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27045144).

25661168 is an abundant number, since it is smaller than the sum of its proper divisors (28429120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25661168 is a wasteful number, since it uses less digits than its factorization.

25661168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281 (or 1275 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 25661168 is about 5065.6853435641. The cubic root of 25661168 is about 294.9570673900.

The spelling of 25661168 in words is "twenty-five million, six hundred sixty-one thousand, one hundred sixty-eight".