25479899136 has 144 divisors (see below), whose sum is σ = 76317696000. Its totient is φ = 8493133824.

The previous prime is 25479899131. The next prime is 25479899147. The reversal of 25479899136 is 63199897452.

25479899136 is a `hidden beast` number, since 2 + 547 + 9 + 89 + 9 + 1 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (25479899131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472065 + ... + 523263.

It is an arithmetic number, because the mean of its divisors is an integer number (529984000).

Almost surely, 2^25479899136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25479899136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38158848000).

25479899136 is an abundant number, since it is smaller than the sum of its proper divisors (50837796864).

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

25479899136 is an frugal number, since it uses more digits than its factorization.

25479899136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51236 (or 51204 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The spelling of 25479899136 in words is "twenty-five billion, four hundred seventy-nine million, eight hundred ninety-nine thousand, one hundred thirty-six".