1666853568668 has 24 divisors (see below), whose sum is σ = 2948424915072. Its totient is φ = 824463543024.

The previous prime is 1666853568631. The next prime is 1666853568671. The reversal of 1666853568668 is 8668653586661.

It is a junction number, because it is equal to n+sod(n) for n = 1666853568595 and 1666853568604.

It is a congruent number.

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, 1745930 + ... + 2526257.

It is an arithmetic number, because the mean of its divisors is an integer number (122851038128).

Almost surely, 2^{1666853568668} is an apocalyptic number.

It is an amenable number.

1666853568668 is a deficient number, since it is larger than the sum of its proper divisors (1281571346404).

1666853568668 is a wasteful number, since it uses less digits than its factorization.

1666853568668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273241 (or 4273239 counting only the distinct ones).

The product of its digits is 1791590400, while the sum is 74.

The spelling of 1666853568668 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty-three million, five hundred sixty-eight thousand, six hundred sixty-eight".