25656043400 has 96 divisors (see below), whose sum is σ = 64863140160. Its totient is φ = 9380931840.

The previous prime is 25656043339. The next prime is 25656043433. The reversal of 25656043400 is 434065652.

It is a happy number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 219899 + ... + 315701.

It is an arithmetic number, because the mean of its divisors is an integer number (675657710).

Almost surely, 2^25656043400 is an apocalyptic number.

25656043400 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 25656043400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32431570080).

25656043400 is an abundant number, since it is smaller than the sum of its proper divisors (39207096760).

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

25656043400 is a wasteful number, since it uses less digits than its factorization.

25656043400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95935 (or 95926 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 25656043400 in words is "twenty-five billion, six hundred fifty-six million, forty-three thousand, four hundred".