12155730912 has 384 divisors, whose sum is σ = 39992279040. Its totient is φ = 3611174400.

The previous prime is 12155730901. The next prime is 12155730919. The reversal of 12155730912 is 21903755121.

12155730912 is a `hidden beast` number, since 12 + 1 + 557 + 3 + 0 + 91 + 2 = 666.

12155730912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155730919) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 28203337 + ... + 28203767.

It is an arithmetic number, because the mean of its divisors is an integer number (104146560).

Almost surely, 2^12155730912 is an apocalyptic number.

12155730912 is a gapful number since it is divisible by the number (12) 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 12155730912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19996139520).

12155730912 is an abundant number, since it is smaller than the sum of its proper divisors (27836548128).

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

12155730912 is an equidigital number, since it uses as much as digits as its factorization.

12155730912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The spelling of 12155730912 in words is "twelve billion, one hundred fifty-five million, seven hundred thirty thousand, nine hundred twelve".