1601666 has 16 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 712080.

The previous prime is 1601659. The next prime is 1601671. The reversal of 1601666 is 6661061.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260 + ... + 1808.

It is an arithmetic number, because the mean of its divisors is an integer number (167400).

2^1601666 is an apocalyptic number.

1601666 is a deficient number, since it is larger than the sum of its proper divisors (1076734).

1601666 is a wasteful number, since it uses less digits than its factorization.

1601666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

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

The square root of 1601666 is about 1265.5694370520. The cubic root of 1601666 is about 117.0012905597.

The spelling of 1601666 in words is "one million, six hundred one thousand, six hundred sixty-six".