1661606 has 12 divisors (see below), whose sum is σ = 2568852. Its totient is φ = 805644.

The previous prime is 1661599. The next prime is 1661623. The reversal of 1661606 is 6061661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11885 + ... + 12023.

It is an arithmetic number, because the mean of its divisors is an integer number (214071).

2^1661606 is an apocalyptic number.

1661606 is a deficient number, since it is larger than the sum of its proper divisors (907246).

1661606 is an equidigital number, since it uses as much as digits as its factorization.

1661606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1661606 is about 1289.0329708739. The cubic root of 1661606 is about 118.4429868108.

The spelling of 1661606 in words is "one million, six hundred sixty-one thousand, six hundred six".