12266155728 has 80 divisors (see below), whose sum is σ = 35303266240. Its totient is φ = 4077703296.

The previous prime is 12266155721. The next prime is 12266155729. The reversal of 12266155728 is 82755166221.

12266155728 is a `hidden beast` number, since 1 + 2 + 2 + 6 + 615 + 5 + 7 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12266155721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123075 + ... + 199197.

It is an arithmetic number, because the mean of its divisors is an integer number (441290828).

Almost surely, 2^12266155728 is an apocalyptic number.

12266155728 is a gapful number since it is divisible by the number (18) 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 12266155728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17651633120).

12266155728 is an abundant number, since it is smaller than the sum of its proper divisors (23037110512).

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

12266155728 is a wasteful number, since it uses less digits than its factorization.

12266155728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76513 (or 76501 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 12266155728 in words is "twelve billion, two hundred sixty-six million, one hundred fifty-five thousand, seven hundred twenty-eight".