1666256 has 20 divisors (see below), whose sum is σ = 3249792. Its totient is φ = 827616.

The previous prime is 1666237. The next prime is 1666261. The reversal of 1666256 is 6526661.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335 + ... + 3801.

2^1666256 is an apocalyptic number.

1666256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666256 is a deficient number, since it is larger than the sum of its proper divisors (1583536).

1666256 is a wasteful number, since it uses less digits than its factorization.

1666256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698 (or 692 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 1666256 is about 1290.8353884210. The cubic root of 1666256 is about 118.5533713663.

The spelling of 1666256 in words is "one million, six hundred sixty-six thousand, two hundred fifty-six".