25520918720 has 336 divisors, whose sum is σ = 70819658208. Its totient is φ = 8680734720.

The previous prime is 25520918719. The next prime is 25520918723. The reversal of 25520918720 is 2781902552.

It is not an unprimeable number, because it can be changed into a prime (25520918723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109531724 + ... + 109531956.

Almost surely, 2^25520918720 is an apocalyptic number.

25520918720 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 25520918720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35409829104).

25520918720 is an abundant number, since it is smaller than the sum of its proper divisors (45298739488).

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

25520918720 is a wasteful number, since it uses less digits than its factorization.

25520918720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

It can be divided in two parts, 25520 and 918720, that multiplied together give a square (23445734400 = 153120²).

The spelling of 25520918720 in words is "twenty-five billion, five hundred twenty million, nine hundred eighteen thousand, seven hundred twenty".