13565989800 has 576 divisors, whose sum is σ = 53962796160. Its totient is φ = 3016704000.

The previous prime is 13565989781. The next prime is 13565989861. The reversal of 13565989800 is 898956531.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 13800109 + ... + 13801091.

It is an arithmetic number, because the mean of its divisors is an integer number (93685410).

Almost surely, 2^13565989800 is an apocalyptic number.

13565989800 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 13565989800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26981398080).

13565989800 is an abundant number, since it is smaller than the sum of its proper divisors (40396806360).

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

13565989800 is a wasteful number, since it uses less digits than its factorization.

13565989800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074 (or 1062 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 13565989800 in words is "thirteen billion, five hundred sixty-five million, nine hundred eighty-nine thousand, eight hundred".