1666169 has 8 divisors (see below), whose sum is σ = 1711080. Its totient is φ = 1622016.

The previous prime is 1666151. The next prime is 1666177. The reversal of 1666169 is 9616661.

It can be written as a sum of positive squares in 4 ways, for example, as 7225 + 1658944 = 85^2 + 1288^2 .

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 1666169 - 2¹⁶ = 1600633 is a prime.

It is a super-2 number, since 2×1666169² = 5552238273122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8537 + ... + 8729.

It is an arithmetic number, because the mean of its divisors is an integer number (213885).

2^1666169 is an apocalyptic number.

It is an amenable number.

1666169 is a deficient number, since it is larger than the sum of its proper divisors (44911).

1666169 is an equidigital number, since it uses as much as digits as its factorization.

1666169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379.

The product of its digits is 11664, while the sum is 35.

The square root of 1666169 is about 1290.8016888740. The cubic root of 1666169 is about 118.5513079933.

The spelling of 1666169 in words is "one million, six hundred sixty-six thousand, one hundred sixty-nine".