668648666668 has 24 divisors (see below), whose sum is σ = 1208931139584. Its totient is φ = 323258514000.

The previous prime is 668648666629. The next prime is 668648666671. The reversal of 668648666668 is 866666846866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 668648666594 and 668648666603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2199730 + ... + 2485177.

It is an arithmetic number, because the mean of its divisors is an integer number (50372130816).

Almost surely, 2^668648666668 is an apocalyptic number.

It is an amenable number.

668648666668 is a deficient number, since it is larger than the sum of its proper divisors (540282472916).

668648666668 is a wasteful number, since it uses less digits than its factorization.

668648666668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4686093 (or 4686091 counting only the distinct ones).

The product of its digits is 3439853568, while the sum is 76.

The spelling of 668648666668 in words is "six hundred sixty-eight billion, six hundred forty-eight million, six hundred sixty-six thousand, six hundred sixty-eight".