866628670665 has 16 divisors (see below), whose sum is σ = 1406135534976. Its totient is φ = 455692070400.

The previous prime is 866628670651. The next prime is 866628670703. The reversal of 866628670665 is 566076826668.

It is not a de Polignac number, because 866628670665 - 2¹⁸ = 866628408521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866628670596 and 866628670605.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 406866856 + ... + 406868985.

It is an arithmetic number, because the mean of its divisors is an integer number (87883470936).

Almost surely, 2^866628670665 is an apocalyptic number.

It is an amenable number.

866628670665 is a deficient number, since it is larger than the sum of its proper divisors (539506864311).

866628670665 is a wasteful number, since it uses less digits than its factorization.

866628670665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813735920.

The product of its (nonzero) digits is 209018880, while the sum is 66.

The spelling of 866628670665 in words is "eight hundred sixty-six billion, six hundred twenty-eight million, six hundred seventy thousand, six hundred sixty-five".