866287949782667 has 4 divisors (see below), whose sum is σ = 876725153997000. Its totient is φ = 855850745568336.

The previous prime is 866287949782637. The next prime is 866287949782709. The reversal of 866287949782667 is 766287949782668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 866287949782667 - 2¹² = 866287949778571 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866287949782667.

It is not an unprimeable number, because it can be changed into a prime (866287949782637) 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 3 ways as a sum of consecutive naturals, for example, 5218602107042 + ... + 5218602107207.

It is an arithmetic number, because the mean of its divisors is an integer number (219181288499250).

Almost surely, 2^{866287949782667} is an apocalyptic number.

866287949782667 is a deficient number, since it is larger than the sum of its proper divisors (10437204214333).

866287949782667 is a wasteful number, since it uses less digits than its factorization.

866287949782667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437204214332.

The product of its digits is 294967443456, while the sum is 95.

Subtracting from 866287949782667 its reverse (766287949782668), we obtain a palindrome (99999999999999).

The spelling of 866287949782667 in words is "eight hundred sixty-six trillion, two hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-two thousand, six hundred sixty-seven".