25161171534 has 64 divisors (see below), whose sum is σ = 58925318400. Its totient is φ = 7936348896.

The previous prime is 25161171467. The next prime is 25161171569. The reversal of 25161171534 is 43517116152.

25161171534 is a `hidden beast` number, since 2 + 5 + 1 + 6 + 117 + 1 + 534 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 892072 + ... + 919844.

It is an arithmetic number, because the mean of its divisors is an integer number (920708100).

Almost surely, 2^25161171534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25161171534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29462659200).

25161171534 is an abundant number, since it is smaller than the sum of its proper divisors (33764146866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25161171534 is a wasteful number, since it uses less digits than its factorization.

25161171534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28686 (or 28680 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

Adding to 25161171534 its reverse (43517116152), we get a palindrome (68678287686).

The spelling of 25161171534 in words is "twenty-five billion, one hundred sixty-one million, one hundred seventy-one thousand, five hundred thirty-four".