866507646755685 has 32 divisors (see below), whose sum is σ = 1522083148394112. Its totient is φ = 417448964724480.

The previous prime is 866507646755629. The next prime is 866507646755689. The reversal of 866507646755685 is 586557646705668.

It is not a de Polignac number, because 866507646755685 - 2¹² = 866507646751589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866507646755598 and 866507646755607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866507646755689) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 16724692234 + ... + 16724744043.

It is an arithmetic number, because the mean of its divisors is an integer number (47565098387316).

Almost surely, 2^{866507646755685} is an apocalyptic number.

It is an amenable number.

866507646755685 is a deficient number, since it is larger than the sum of its proper divisors (655575501638427).

866507646755685 is a wasteful number, since it uses less digits than its factorization.

866507646755685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33449436453.

The product of its (nonzero) digits is 60963840000, while the sum is 84.

The spelling of 866507646755685 in words is "eight hundred sixty-six trillion, five hundred seven billion, six hundred forty-six million, seven hundred fifty-five thousand, six hundred eighty-five".