12158085017 has 4 divisors (see below), whose sum is σ = 13093322340. Its totient is φ = 11222847696.

The previous prime is 12158085013. The next prime is 12158085073. The reversal of 12158085017 is 71058085121.

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 3961317721 + 8196767296 = 62939^2 + 90536^2 .

It is a cyclic number.

It is not a de Polignac number, because 12158085017 - 2² = 12158085013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12158085011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467618642 + ... + 467618667.

It is an arithmetic number, because the mean of its divisors is an integer number (3273330585).

Almost surely, 2^12158085017 is an apocalyptic number.

It is an amenable number.

12158085017 is a deficient number, since it is larger than the sum of its proper divisors (935237323).

12158085017 is an equidigital number, since it uses as much as digits as its factorization.

12158085017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935237322.

The product of its (nonzero) digits is 22400, while the sum is 38.

The spelling of 12158085017 in words is "twelve billion, one hundred fifty-eight million, eighty-five thousand, seventeen".