25665161 has 8 divisors (see below), whose sum is σ = 26448000. Its totient is φ = 24887088.

The previous prime is 25665131. The next prime is 25665163. The reversal of 25665161 is 16156652.

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

It is not a de Polignac number, because 25665161 - 2⁶ = 25665097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25665163) by changing a digit.

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, 11840 + ... + 13838.

It is an arithmetic number, because the mean of its divisors is an integer number (3306000).

Almost surely, 2^25665161 is an apocalyptic number.

It is an amenable number.

25665161 is a deficient number, since it is larger than the sum of its proper divisors (782839).

25665161 is a wasteful number, since it uses less digits than its factorization.

25665161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383.

The product of its digits is 10800, while the sum is 32.

The square root of 25665161 is about 5066.0794506206. The cubic root of 25665161 is about 294.9723655048.

The spelling of 25665161 in words is "twenty-five million, six hundred sixty-five thousand, one hundred sixty-one".