25163794161 has 135 divisors (see below), whose sum is σ = 44111739945. Its totient is φ = 13819932720.

The previous prime is 25163794141. The next prime is 25163794163. The reversal of 25163794161 is 16149736152.

The square root of 25163794161 is 158631.

It is a perfect power (a square), and thus also a powerful number.

25163794161 is a `hidden beast` number, since 2 + 5 + 1 + 637 + 9 + 4 + 1 + 6 + 1 = 666.

It is not a de Polignac number, because 25163794161 - 2³³ = 16573859569 is a prime.

Its product of digits (272160) is a multiple of the sum of its prime divisors (56).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25163794163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 1094077996 + ... + 1094078018.

Almost surely, 2^25163794161 is an apocalyptic number.

25163794161 is the 158631-st square number.

25163794161 is the 79316-th centered octagonal number.

It is an amenable number.

25163794161 is a deficient number, since it is larger than the sum of its proper divisors (18947945784).

25163794161 is an equidigital number, since it uses as much as digits as its factorization.

25163794161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 56 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 25163794161 in words is "twenty-five billion, one hundred sixty-three million, seven hundred ninety-four thousand, one hundred sixty-one".