25266161 has 4 divisors (see below), whose sum is σ = 25287024. Its totient is φ = 25245300.

The previous prime is 25266151. The next prime is 25266173. The reversal of 25266161 is 16166252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25266161 - 2¹⁸ = 25004017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25266151) 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, 8495 + ... + 11076.

It is an arithmetic number, because the mean of its divisors is an integer number (6321756).

Almost surely, 2^25266161 is an apocalyptic number.

It is an amenable number.

25266161 is a deficient number, since it is larger than the sum of its proper divisors (20863).

25266161 is a wasteful number, since it uses less digits than its factorization.

25266161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20862.

The product of its digits is 4320, while the sum is 29.

The square root of 25266161 is about 5026.5456329372. The cubic root of 25266161 is about 293.4357922324.

Subtracting from 25266161 its reverse (16166252), we obtain a palindrome (9099909).

The spelling of 25266161 in words is "twenty-five million, two hundred sixty-six thousand, one hundred sixty-one".