25504151121 has 24 divisors (see below), whose sum is σ = 37234153320. Its totient is φ = 16820683776.

The previous prime is 25504151093. The next prime is 25504151137. The reversal of 25504151121 is 12115140552.

It is a happy number.

25504151121 is a `hidden beast` number, since 2 + 5 + 504 + 151 + 1 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12834397521 + 12669753600 = 113289^2 + 112560^2 .

It is not a de Polignac number, because 25504151121 - 2²² = 25499956817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25504151921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3080175 + ... + 3088443.

It is an arithmetic number, because the mean of its divisors is an integer number (1551423055).

Almost surely, 2^25504151121 is an apocalyptic number.

It is an amenable number.

25504151121 is a deficient number, since it is larger than the sum of its proper divisors (11730002199).

25504151121 is a wasteful number, since it uses less digits than its factorization.

25504151121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11905 (or 11902 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 25504151121 its reverse (12115140552), we get a palindrome (37619291673).

The spelling of 25504151121 in words is "twenty-five billion, five hundred four million, one hundred fifty-one thousand, one hundred twenty-one".