666868880868 has 48 divisors (see below), whose sum is σ = 1564063530624. Its totient is φ = 221144094720.

The previous prime is 666868880827. The next prime is 666868880947. The reversal of 666868880868 is 868088868666.

It is a junction number, because it is equal to n+sod(n) for n = 666868880793 and 666868880802.

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, 1995588 + ... + 2305668.

It is an arithmetic number, because the mean of its divisors is an integer number (32584656888).

Almost surely, 2^666868880868 is an apocalyptic number.

It is an amenable number.

666868880868 is an abundant number, since it is smaller than the sum of its proper divisors (897194649756).

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

666868880868 is a wasteful number, since it uses less digits than its factorization.

666868880868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311012 (or 311010 counting only the distinct ones).

The product of its (nonzero) digits is 2038431744, while the sum is 78.

The spelling of 666868880868 in words is "six hundred sixty-six billion, eight hundred sixty-eight million, eight hundred eighty thousand, eight hundred sixty-eight".