866779868977668 has 48 divisors (see below), whose sum is σ = 2249408054360320. Its totient is φ = 288643638996000.

The previous prime is 866779868977663. The next prime is 866779868977709.

866779868977668 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (108).

It is a self number, because there is not a number n which added to its sum of digits gives 866779868977668.

It is not an unprimeable number, because it can be changed into a prime (866779868977663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3930222508 + ... + 3930443043.

Almost surely, 2^{866779868977668} is an apocalyptic number.

It is an amenable number.

866779868977668 is an abundant number, since it is smaller than the sum of its proper divisors (1382628185382652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866779868977668 is a wasteful number, since it uses less digits than its factorization.

866779868977668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7860666585 (or 7860666577 counting only the distinct ones).

The product of its digits is 6194316312576, while the sum is 108.

The spelling of 866779868977668 in words is "eight hundred sixty-six trillion, seven hundred seventy-nine billion, eight hundred sixty-eight million, nine hundred seventy-seven thousand, six hundred sixty-eight".