1666485 has 24 divisors (see below), whose sum is σ = 2990520. Its totient is φ = 857472.

The previous prime is 1666481. The next prime is 1666487. The reversal of 1666485 is 5846661.

It can be written as a sum of positive squares in 4 ways, for example, as 269361 + 1397124 = 519^2 + 1182^2 .

It is not a de Polignac number, because 1666485 - 2² = 1666481 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666481) 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 23 ways as a sum of consecutive naturals, for example, 667 + ... + 1943.

It is an arithmetic number, because the mean of its divisors is an integer number (124605).

2^1666485 is an apocalyptic number.

1666485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1666485 is a deficient number, since it is larger than the sum of its proper divisors (1324035).

1666485 is a wasteful number, since it uses less digits than its factorization.

1666485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317 (or 1314 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1666485 is about 1290.9240876210. The cubic root of 1666485 is about 118.5588022001.

The spelling of 1666485 in words is "one million, six hundred sixty-six thousand, four hundred eighty-five".