25709617880 has 64 divisors (see below), whose sum is σ = 58755011040. Its totient is φ = 10122596352.

The previous prime is 25709617873. The next prime is 25709617883. The reversal of 25709617880 is 8871690752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25709617883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4545134 + ... + 4550786.

Almost surely, 2^25709617880 is an apocalyptic number.

25709617880 is a gapful number since it is divisible by the number (20) 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 25709617880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29377505520).

25709617880 is an abundant number, since it is smaller than the sum of its proper divisors (33045393160).

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

25709617880 is a wasteful number, since it uses less digits than its factorization.

25709617880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7428 (or 7424 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 53.

The spelling of 25709617880 in words is "twenty-five billion, seven hundred nine million, six hundred seventeen thousand, eight hundred eighty".