12390666789685 has 16 divisors (see below), whose sum is σ = 15063658337520. Its totient is φ = 9783039720960.

The previous prime is 12390666789649. The next prime is 12390666789701. The reversal of 12390666789685 is 58698766609321.

It can be written as a sum of positive squares in 8 ways, for example, as 2453690413476 + 9936976376209 = 1566426^2 + 3152297^2 .

It is not a de Polignac number, because 12390666789685 - 2¹¹ = 12390666787637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25493262 + ... + 25974751.

It is an arithmetic number, because the mean of its divisors is an integer number (941478646095).

Almost surely, 2^{12390666789685} is an apocalyptic number.

It is an amenable number.

12390666789685 is a deficient number, since it is larger than the sum of its proper divisors (2672991547835).

12390666789685 is an equidigital number, since it uses as much as digits as its factorization.

12390666789685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51468648.

The product of its (nonzero) digits is 1410877440, while the sum is 76.

The spelling of 12390666789685 in words is "twelve trillion, three hundred ninety billion, six hundred sixty-six million, seven hundred eighty-nine thousand, six hundred eighty-five".