25489291520 has 144 divisors (see below), whose sum is σ = 76120587648. Its totient is φ = 7944683520.

The previous prime is 25489291511. The next prime is 25489291543. The reversal of 25489291520 is 2519298452.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30749 + ... + 227868.

It is an arithmetic number, because the mean of its divisors is an integer number (528615192).

Almost surely, 2^25489291520 is an apocalyptic number.

25489291520 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 25489291520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38060293824).

25489291520 is an abundant number, since it is smaller than the sum of its proper divisors (50631296128).

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

25489291520 is a wasteful number, since it uses less digits than its factorization.

25489291520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258656 (or 258642 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 25489291520 in words is "twenty-five billion, four hundred eighty-nine million, two hundred ninety-one thousand, five hundred twenty".