25496197440 has 336 divisors, whose sum is σ = 99709175232. Its totient is φ = 5484724224.

The previous prime is 25496197381. The next prime is 25496197469. The reversal of 25496197440 is 4479169452.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent 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 47 ways as a sum of consecutive naturals, for example, 783739 + ... + 815621.

Almost surely, 2^25496197440 is an apocalyptic number.

25496197440 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 25496197440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49854587616).

25496197440 is an abundant number, since it is smaller than the sum of its proper divisors (74212977792).

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

25496197440 is a wasteful number, since it uses less digits than its factorization.

25496197440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31934 (or 31917 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 25496197440 in words is "twenty-five billion, four hundred ninety-six million, one hundred ninety-seven thousand, four hundred forty".