25112121161 has 4 divisors (see below), whose sum is σ = 25262493312. Its totient is φ = 24961749012.

The previous prime is 25112121127. The next prime is 25112121179. The reversal of 25112121161 is 16112121152.

It is a happy number.

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 25112121161 - 2¹⁴ = 25112104777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25112124161) 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, 75185825 + ... + 75186158.

It is an arithmetic number, because the mean of its divisors is an integer number (6315623328).

Almost surely, 2^25112121161 is an apocalyptic number.

It is an amenable number.

25112121161 is a deficient number, since it is larger than the sum of its proper divisors (150372151).

25112121161 is a wasteful number, since it uses less digits than its factorization.

25112121161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150372150.

The product of its digits is 240, while the sum is 23.

Subtracting from 25112121161 its reverse (16112121152), we obtain a palindrome (9000000009).

The spelling of 25112121161 in words is "twenty-five billion, one hundred twelve million, one hundred twenty-one thousand, one hundred sixty-one".