665678876566 has 32 divisors (see below), whose sum is σ = 1102585271040. Its totient is φ = 298902588000.

The previous prime is 665678876549. The next prime is 665678876587.

665678876566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665678876492 and 665678876501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 634245 + ... + 1316671.

It is an arithmetic number, because the mean of its divisors is an integer number (34455789720).

Almost surely, 2^665678876566 is an apocalyptic number.

665678876566 is a deficient number, since it is larger than the sum of its proper divisors (436906394474).

665678876566 is a wasteful number, since it uses less digits than its factorization.

665678876566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682980.

The product of its digits is 3657830400, while the sum is 76.

The spelling of 665678876566 in words is "six hundred sixty-five billion, six hundred seventy-eight million, eight hundred seventy-six thousand, five hundred sixty-six".