12156442333423 has 4 divisors (see below), whose sum is σ = 12160216457208. Its totient is φ = 12152668209640.

The previous prime is 12156442333421. The next prime is 12156442333457. The reversal of 12156442333423 is 32433324465121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12156442333423 - 2¹ = 12156442333421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12156442333423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156442333421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887057061 + ... + 1887063502.

It is an arithmetic number, because the mean of its divisors is an integer number (3040054114302).

Almost surely, 2^{12156442333423} is an apocalyptic number.

12156442333423 is a deficient number, since it is larger than the sum of its proper divisors (3774123785).

12156442333423 is an equidigital number, since it uses as much as digits as its factorization.

12156442333423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3774123784.

The product of its digits is 1244160, while the sum is 43.

Adding to 12156442333423 its reverse (32433324465121), we get a palindrome (44589766798544).

The spelling of 12156442333423 in words is "twelve trillion, one hundred fifty-six billion, four hundred forty-two million, three hundred thirty-three thousand, four hundred twenty-three".