1666533 has 12 divisors (see below), whose sum is σ = 2442944. Its totient is φ = 1009800.

The previous prime is 1666531. The next prime is 1666541. The reversal of 1666533 is 3356661.

It is not a de Polignac number, because 1666533 - 2¹ = 1666531 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666531) 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 11 ways as a sum of consecutive naturals, for example, 1933 + ... + 2658.

2^1666533 is an apocalyptic number.

It is an amenable number.

1666533 is a deficient number, since it is larger than the sum of its proper divisors (776411).

1666533 is a wasteful number, since it uses less digits than its factorization.

1666533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4616 (or 4605 counting only the distinct ones).

The product of its digits is 9720, while the sum is 30.

The square root of 1666533 is about 1290.9426788204. The cubic root of 1666533 is about 118.5599404778.

It can be divided in two parts, 16665 and 33, that multiplied together give a palindrome (549945).

The spelling of 1666533 in words is "one million, six hundred sixty-six thousand, five hundred thirty-three".