25134539808 has 144 divisors (see below), whose sum is σ = 76817178144. Its totient is φ = 7175024640.

The previous prime is 25134539777. The next prime is 25134539809. The reversal of 25134539808 is 80893543152.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (25134539809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9458416 + ... + 9461072.

It is an arithmetic number, because the mean of its divisors is an integer number (533452626).

Almost surely, 2^25134539808 is an apocalyptic number.

25134539808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25134539808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38408589072).

25134539808 is an abundant number, since it is smaller than the sum of its proper divisors (51682638336).

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

25134539808 is a wasteful number, since it uses less digits than its factorization.

25134539808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695 (or 4680 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 25134539808 in words is "twenty-five billion, one hundred thirty-four million, five hundred thirty-nine thousand, eight hundred eight".