12165534720 has 176 divisors, whose sum is σ = 43234605120. Its totient is φ = 3244105728.

The previous prime is 12165534683. The next prime is 12165534763. The reversal of 12165534720 is 2743556121.

12165534720 is a `hidden beast` number, since 121 + 65 + 5 + 3 + 472 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94239 + ... + 182241.

Almost surely, 2^12165534720 is an apocalyptic number.

12165534720 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 12165534720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21617302560).

12165534720 is an abundant number, since it is smaller than the sum of its proper divisors (31069070400).

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

12165534720 is an equidigital number, since it uses as much as digits as its factorization.

12165534720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88037 (or 88013 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 12165534720 in words is "twelve billion, one hundred sixty-five million, five hundred thirty-four thousand, seven hundred twenty".