25405331121 has 6 divisors (see below), whose sum is σ = 36696589410. Its totient is φ = 16936887408.

The previous prime is 25405331113. The next prime is 25405331123. The reversal of 25405331121 is 12113350452.

25405331121 is a `hidden beast` number, since 2 + 5 + 4 + 0 + 533 + 1 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22669518096 + 2735813025 = 150564^2 + 52305^2 .

It is not a de Polignac number, because 25405331121 - 2³ = 25405331113 is a prime.

It is a super-3 number, since 3×25405331121³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (25405331123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1411407276 + ... + 1411407293.

It is an arithmetic number, because the mean of its divisors is an integer number (6116098235).

Almost surely, 2^25405331121 is an apocalyptic number.

It is an amenable number.

25405331121 is a deficient number, since it is larger than the sum of its proper divisors (11291258289).

25405331121 is a wasteful number, since it uses less digits than its factorization.

25405331121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822814575 (or 2822814572 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 25405331121 its reverse (12113350452), we get a palindrome (37518681573).

The spelling of 25405331121 in words is "twenty-five billion, four hundred five million, three hundred thirty-one thousand, one hundred twenty-one".