1666159 has 8 divisors (see below), whose sum is σ = 1830528. Its totient is φ = 1503960.

The previous prime is 1666151. The next prime is 1666177. The reversal of 1666159 is 9516661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666159 - 2³ = 1666151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1384 + ... + 2290.

It is an arithmetic number, because the mean of its divisors is an integer number (228816).

2^1666159 is an apocalyptic number.

1666159 is a deficient number, since it is larger than the sum of its proper divisors (164369).

1666159 is a wasteful number, since it uses less digits than its factorization.

1666159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085.

The product of its digits is 9720, while the sum is 34.

The square root of 1666159 is about 1290.7978153065. The cubic root of 1666159 is about 118.5510708194.

The spelling of 1666159 in words is "one million, six hundred sixty-six thousand, one hundred fifty-nine".