12129085545 has 8 divisors (see below), whose sum is σ = 19406536896. Its totient is φ = 6468845616.

The previous prime is 12129085517. The next prime is 12129085547. The reversal of 12129085545 is 54558092121.

12129085545 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 12129085545 - 2⁶ = 12129085481 is a prime.

It is a super-2 number, since 2×12129085545² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12129085497 and 12129085506.

It is not an unprimeable number, because it can be changed into a prime (12129085547) 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 7 ways as a sum of consecutive naturals, for example, 404302837 + ... + 404302866.

It is an arithmetic number, because the mean of its divisors is an integer number (2425817112).

Almost surely, 2^12129085545 is an apocalyptic number.

12129085545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12129085545 is a deficient number, since it is larger than the sum of its proper divisors (7277451351).

12129085545 is an equidigital number, since it uses as much as digits as its factorization.

12129085545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808605711.

The product of its (nonzero) digits is 144000, while the sum is 42.

The spelling of 12129085545 in words is "twelve billion, one hundred twenty-nine million, eighty-five thousand, five hundred forty-five".