12156215145 has 8 divisors (see below), whose sum is σ = 19449944256. Its totient is φ = 6483314736.

The previous prime is 12156215119. The next prime is 12156215153. The reversal of 12156215145 is 54151265121.

It is a happy number.

12156215145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12156215145 - 2⁷ = 12156215017 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 405207157 + ... + 405207186.

It is an arithmetic number, because the mean of its divisors is an integer number (2431243032).

Almost surely, 2^12156215145 is an apocalyptic number.

12156215145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12156215145 is a deficient number, since it is larger than the sum of its proper divisors (7293729111).

12156215145 is an equidigital number, since it uses as much as digits as its factorization.

12156215145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810414351.

The product of its digits is 12000, while the sum is 33.

The spelling of 12156215145 in words is "twelve billion, one hundred fifty-six million, two hundred fifteen thousand, one hundred forty-five".