12127085545 has 4 divisors (see below), whose sum is σ = 14552502660. Its totient is φ = 9701668432.

The previous prime is 12127085489. The next prime is 12127085567. The reversal of 12127085545 is 54558072121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9395037184 + 2732048361 = 96928^2 + 52269^2 .

It is a cyclic number.

It is not a de Polignac number, because 12127085545 - 2¹³ = 12127077353 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 12127085498 and 12127085507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212708550 + ... + 1212708559.

It is an arithmetic number, because the mean of its divisors is an integer number (3638125665).

Almost surely, 2^12127085545 is an apocalyptic number.

It is an amenable number.

12127085545 is a deficient number, since it is larger than the sum of its proper divisors (2425417115).

12127085545 is an equidigital number, since it uses as much as digits as its factorization.

12127085545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425417114.

The product of its (nonzero) digits is 112000, while the sum is 40.

The spelling of 12127085545 in words is "twelve billion, one hundred twenty-seven million, eighty-five thousand, five hundred forty-five".