12187665309 has 8 divisors (see below), whose sum is σ = 16810572960. Its totient is φ = 7844933936.

The previous prime is 12187665299. The next prime is 12187665359. The reversal of 12187665309 is 90356678121.

12187665309 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 a cyclic number.

It is not a de Polignac number, because 12187665309 - 2⁵ = 12187665277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12187665359) 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, 70043967 + ... + 70044140.

It is an arithmetic number, because the mean of its divisors is an integer number (2101321620).

Almost surely, 2^12187665309 is an apocalyptic number.

It is an amenable number.

12187665309 is a deficient number, since it is larger than the sum of its proper divisors (4622907651).

12187665309 is a wasteful number, since it uses less digits than its factorization.

12187665309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140088139.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 12187665309 in words is "twelve billion, one hundred eighty-seven million, six hundred sixty-five thousand, three hundred nine".