12156147225 has 24 divisors (see below), whose sum is σ = 22331293920. Its totient is φ = 6483278160.

The previous prime is 12156147217. The next prime is 12156147247. The reversal of 12156147225 is 52274165121.

12156147225 is a `hidden beast` number, since 1 + 2 + 1 + 561 + 4 + 72 + 25 = 666.

It is not a de Polignac number, because 12156147225 - 2³ = 12156147217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12156147225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9003879 + ... + 9005228.

It is an arithmetic number, because the mean of its divisors is an integer number (930470580).

Almost surely, 2^12156147225 is an apocalyptic number.

12156147225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12156147225 is a deficient number, since it is larger than the sum of its proper divisors (10175146695).

12156147225 is a wasteful number, since it uses less digits than its factorization.

12156147225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18009126 (or 18009115 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The spelling of 12156147225 in words is "twelve billion, one hundred fifty-six million, one hundred forty-seven thousand, two hundred twenty-five".