12169619856 has 135 divisors (see below), whose sum is σ = 35384567491. Its totient is φ = 3904303872.

The previous prime is 12169619821. The next prime is 12169619899. The reversal of 12169619856 is 65891696121.

The square root of 12169619856 is 110316.

It is a perfect power (a square), and thus also a powerful number.

12169619856 is a `hidden beast` number, since 1 + 2 + 16 + 9 + 619 + 8 + 5 + 6 = 666.

12169619856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3027200400 + 9142419456 = 55020^2 + 95616^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 38389810 + ... + 38390126.

Almost surely, 2^12169619856 is an apocalyptic number.

12169619856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

12169619856 is the 110316-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12169619856

12169619856 is an abundant number, since it is smaller than the sum of its proper divisors (23214947635).

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

12169619856 is an equidigital number, since it uses as much as digits as its factorization.

12169619856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 351 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

It can be divided in two parts, 12169 and 619856, that added together give a square (632025 = 795²).

The spelling of 12169619856 in words is "twelve billion, one hundred sixty-nine million, six hundred nineteen thousand, eight hundred fifty-six".