25115840640 has 512 divisors, whose sum is σ = 97631136000. Its totient is φ = 6051594240.

The previous prime is 25115840623. The next prime is 25115840653. The reversal of 25115840640 is 4604851152.

It is a happy number.

25115840640 is a `hidden beast` number, since 2 + 5 + 1 + 1 + 5 + 8 + 4 + 0 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25115840595 and 25115840604.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43528032 + ... + 43528608.

Almost surely, 2^25115840640 is an apocalyptic number.

25115840640 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 25115840640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48815568000).

25115840640 is an abundant number, since it is smaller than the sum of its proper divisors (72515295360).

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

25115840640 is a wasteful number, since it uses less digits than its factorization.

25115840640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 25115840640 in words is "twenty-five billion, one hundred fifteen million, eight hundred forty thousand, six hundred forty".