25501008870 has 80 divisors (see below), whose sum is σ = 68864178240. Its totient is φ = 6771033216.

The previous prime is 25501008839. The next prime is 25501008889. The reversal of 25501008870 is 7880010552.

25501008870 is a `hidden beast` number, since 2 + 5 + 501 + 0 + 0 + 88 + 70 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 121171 + ... + 256289.

It is an arithmetic number, because the mean of its divisors is an integer number (860802228).

Almost surely, 2^25501008870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25501008870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34432089120).

25501008870 is an abundant number, since it is smaller than the sum of its proper divisors (43363169370).

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

25501008870 is a wasteful number, since it uses less digits than its factorization.

25501008870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135371 (or 135362 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The spelling of 25501008870 in words is "twenty-five billion, five hundred one million, eight thousand, eight hundred seventy".