1660165 has 8 divisors (see below), whose sum is σ = 2145528. Its totient is φ = 1225920.

The previous prime is 1660133. The next prime is 1660177. The reversal of 1660165 is 5610661.

It can be written as a sum of positive squares in 4 ways, for example, as 16641 + 1643524 = 129^2 + 1282^2 .

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

It is not a de Polignac number, because 1660165 - 2⁵ = 1660133 is a prime.

It is a super-2 number, since 2×1660165² = 5512295654450, which contains 22 as substring.

It is a Duffinian number.

1660165 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12706 + ... + 12835.

It is an arithmetic number, because the mean of its divisors is an integer number (268191).

2^1660165 is an apocalyptic number.

It is an amenable number.

1660165 is a deficient number, since it is larger than the sum of its proper divisors (485363).

1660165 is a wasteful number, since it uses less digits than its factorization.

1660165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25559.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1660165 is about 1288.4739034998. The cubic root of 1660165 is about 118.4087376754.

The spelling of 1660165 in words is "one million, six hundred sixty thousand, one hundred sixty-five".