123666785 has 16 divisors (see below), whose sum is σ = 162508032. Its totient is φ = 89596800.

The previous prime is 123666779. The next prime is 123666787. The reversal of 123666785 is 587666321.

It is not a de Polignac number, because 123666785 - 2⁴ = 123666769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123666787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10757 + ... + 19053.

It is an arithmetic number, because the mean of its divisors is an integer number (10156752).

Almost surely, 2^123666785 is an apocalyptic number.

It is an amenable number.

123666785 is a deficient number, since it is larger than the sum of its proper divisors (38841247).

123666785 is a wasteful number, since it uses less digits than its factorization.

123666785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8584.

The product of its digits is 362880, while the sum is 44.

The square root of 123666785 is about 11120.5568655531. The cubic root of 123666785 is about 498.2160224182.

The spelling of 123666785 in words is "one hundred twenty-three million, six hundred sixty-six thousand, seven hundred eighty-five".