1665055 has 16 divisors (see below), whose sum is σ = 2309184. Its totient is φ = 1128960.

The previous prime is 1665043. The next prime is 1665061. The reversal of 1665055 is 5505661.

It is not a de Polignac number, because 1665055 - 2⁵ = 1665023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3745 + ... + 4165.

It is an arithmetic number, because the mean of its divisors is an integer number (144324).

2^1665055 is an apocalyptic number.

1665055 is a deficient number, since it is larger than the sum of its proper divisors (644129).

1665055 is a wasteful number, since it uses less digits than its factorization.

1665055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 1665055 is about 1290.3701019475. The cubic root of 1665055 is about 118.5248809820.

Subtracting 1665055 from its reverse (5505661), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1665055 in words is "one million, six hundred sixty-five thousand, fifty-five".