25147165440 has 288 divisors, whose sum is σ = 82879130880. Its totient is φ = 6493519872.

The previous prime is 25147165423. The next prime is 25147165447. The reversal of 25147165440 is 4456174152.

It is not an unprimeable number, because it can be changed into a prime (25147165447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53848087 + ... + 53848553.

It is an arithmetic number, because the mean of its divisors is an integer number (287774760).

Almost surely, 2^25147165440 is an apocalyptic number.

25147165440 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 25147165440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41439565440).

25147165440 is an abundant number, since it is smaller than the sum of its proper divisors (57731965440).

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

25147165440 is a wasteful number, since it uses less digits than its factorization.

25147165440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The spelling of 25147165440 in words is "twenty-five billion, one hundred forty-seven million, one hundred sixty-five thousand, four hundred forty".