25699384920 has 128 divisors (see below), whose sum is σ = 84153738240. Its totient is φ = 6226698240.

The previous prime is 25699384871. The next prime is 25699384939. The reversal of 25699384920 is 2948399652.

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 31 ways as a sum of consecutive naturals, for example, 3014584 + ... + 3023096.

It is an arithmetic number, because the mean of its divisors is an integer number (657451080).

Almost surely, 2^25699384920 is an apocalyptic number.

25699384920 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 25699384920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42076869120).

25699384920 is an abundant number, since it is smaller than the sum of its proper divisors (58454353320).

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

25699384920 is a wasteful number, since it uses less digits than its factorization.

25699384920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10825 (or 10821 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 57.

The spelling of 25699384920 in words is "twenty-five billion, six hundred ninety-nine million, three hundred eighty-four thousand, nine hundred twenty".