25118251008 has 96 divisors (see below), whose sum is σ = 67495034880. Its totient is φ = 8306565120.

The previous prime is 25118251003. The next prime is 25118251021. The reversal of 25118251008 is 80015281152.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 25118251008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25118251001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764193 + ... + 796383.

It is an arithmetic number, because the mean of its divisors is an integer number (703073280).

Almost surely, 2^25118251008 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 25118251008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747517440).

25118251008 is an abundant number, since it is smaller than the sum of its proper divisors (42376783872).

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

25118251008 is a wasteful number, since it uses less digits than its factorization.

25118251008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32343 (or 32323 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 33.

The spelling of 25118251008 in words is "twenty-five billion, one hundred eighteen million, two hundred fifty-one thousand, eight".