12081658709 has 6 divisors (see below), whose sum is σ = 12498879990. Its totient is φ = 11664478280.

The previous prime is 12081658681. The next prime is 12081658733. The reversal of 12081658709 is 90785618021.

It can be written as a sum of positive squares in only one way, i.e., 10415223025 + 1666435684 = 102055^2 + 40822^2 .

It is not a de Polignac number, because 12081658709 - 2³² = 7786691413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12081658739) 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 5 ways as a sum of consecutive naturals, for example, 581714 + ... + 602124.

It is an arithmetic number, because the mean of its divisors is an integer number (2083146665).

Almost surely, 2^12081658709 is an apocalyptic number.

It is an amenable number.

12081658709 is a deficient number, since it is larger than the sum of its proper divisors (417221281).

12081658709 is an frugal number, since it uses more digits than its factorization.

12081658709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40851 (or 20440 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 12081658709 in words is "twelve billion, eighty-one million, six hundred fifty-eight thousand, seven hundred nine".