25540501320 has 96 divisors (see below), whose sum is σ = 83089281600. Its totient is φ = 6804018816.

The previous prime is 25540501297. The next prime is 25540501333. The reversal of 25540501320 is 2310504552.

It is a happy number.

25540501320 is a `hidden beast` number, since 255 + 40 + 50 + 1 + 320 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 332029 + ... + 401651.

It is an arithmetic number, because the mean of its divisors is an integer number (865513350).

Almost surely, 2^25540501320 is an apocalyptic number.

25540501320 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 25540501320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41544640800).

25540501320 is an abundant number, since it is smaller than the sum of its proper divisors (57548780280).

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

25540501320 is a wasteful number, since it uses less digits than its factorization.

25540501320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70659 (or 70652 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The spelling of 25540501320 in words is "twenty-five billion, five hundred forty million, five hundred one thousand, three hundred twenty".