1668556 has 12 divisors (see below), whose sum is σ = 2941960. Its totient is φ = 828000.

The previous prime is 1668553. The next prime is 1668587. The reversal of 1668556 is 6558661.

It is not an unprimeable number, because it can be changed into a prime (1668551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 945 + ... + 2056.

2^1668556 is an apocalyptic number.

It is an amenable number.

1668556 is a deficient number, since it is larger than the sum of its proper divisors (1273404).

1668556 is a wasteful number, since it uses less digits than its factorization.

1668556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144 (or 3142 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 1668556 is about 1291.7259771329. The cubic root of 1668556 is about 118.6078942787.

The spelling of 1668556 in words is "one million, six hundred sixty-eight thousand, five hundred fifty-six".