25578322500 has 120 divisors (see below), whose sum is σ = 78505245280. Its totient is φ = 6461856000.

The previous prime is 25578322499. The next prime is 25578322507. The reversal of 25578322500 is 522387552.

It is not an unprimeable number, because it can be changed into a prime (25578322507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 52752 + ... + 232248.

Almost surely, 2^25578322500 is an apocalyptic number.

25578322500 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 25578322500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39252622640).

25578322500 is an abundant number, since it is smaller than the sum of its proper divisors (52926922780).

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

25578322500 is a wasteful number, since it uses less digits than its factorization.

25578322500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179543 (or 179526 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 39.

The spelling of 25578322500 in words is "twenty-five billion, five hundred seventy-eight million, three hundred twenty-two thousand, five hundred".