25705424940 has 192 divisors, whose sum is σ = 83981753856. Its totient is φ = 5816659968.

The previous prime is 25705424909. The next prime is 25705424959. The reversal of 25705424940 is 4942450752.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25705424892 and 25705424901.

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 63 ways as a sum of consecutive naturals, for example, 547639 + ... + 592721.

It is an arithmetic number, because the mean of its divisors is an integer number (437404968).

Almost surely, 2^25705424940 is an apocalyptic number.

25705424940 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 25705424940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41990876928).

25705424940 is an abundant number, since it is smaller than the sum of its proper divisors (58276328916).

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

25705424940 is a wasteful number, since it uses less digits than its factorization.

25705424940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45168 (or 45166 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 25705424940 in words is "twenty-five billion, seven hundred five million, four hundred twenty-four thousand, nine hundred forty".