1666158 has 32 divisors (see below), whose sum is σ = 3683232. Its totient is φ = 499200.

The previous prime is 1666151. The next prime is 1666177. The reversal of 1666158 is 8516661.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2938 + ... + 3458.

It is an arithmetic number, because the mean of its divisors is an integer number (115101).

2^1666158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1841616).

1666158 is an abundant number, since it is smaller than the sum of its proper divisors (2017074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666158 is a wasteful number, since it uses less digits than its factorization.

1666158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580.

The product of its digits is 8640, while the sum is 33.

The square root of 1666158 is about 1290.7974279491. The cubic root of 1666158 is about 118.5510471020.

The spelling of 1666158 in words is "one million, six hundred sixty-six thousand, one hundred fifty-eight".