13581025920 has 1024 divisors, whose sum is σ = 61337088000. Its totient is φ = 2758164480.

The previous prime is 13581025889. The next prime is 13581025957. The reversal of 13581025920 is 2952018531.

13581025920 is a `hidden beast` number, since 1 + 3 + 58 + 10 + 2 + 592 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 78502954 + ... + 78503126.

It is an arithmetic number, because the mean of its divisors is an integer number (59899500).

Almost surely, 2^13581025920 is an apocalyptic number.

13581025920 is a gapful number since it is divisible by the number (10) 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 13581025920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30668544000).

13581025920 is an abundant number, since it is smaller than the sum of its proper divisors (47756062080).

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

13581025920 is a wasteful number, since it uses less digits than its factorization.

13581025920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 13581025920 in words is "thirteen billion, five hundred eighty-one million, twenty-five thousand, nine hundred twenty".