12087643709 has 2 divisors, whose sum is σ = 12087643710. Its totient is φ = 12087643708.

The previous prime is 12087643639. The next prime is 12087643717. The reversal of 12087643709 is 90734678021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7486056484 + 4601587225 = 86522^2 + 67835^2 .

It is a cyclic number.

It is not a de Polignac number, because 12087643709 - 2⁸ = 12087643453 is a prime.

It is a super-2 number, since 2×12087643709² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12087643759) 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 as a sum of consecutive naturals, namely, 6043821854 + 6043821855.

It is an arithmetic number, because the mean of its divisors is an integer number (6043821855).

Almost surely, 2^12087643709 is an apocalyptic number.

It is an amenable number.

12087643709 is a deficient number, since it is larger than the sum of its proper divisors (1).

12087643709 is an equidigital number, since it uses as much as digits as its factorization.

12087643709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 12087643709 in words is "twelve billion, eighty-seven million, six hundred forty-three thousand, seven hundred nine".