1668533 has 8 divisors (see below), whose sum is σ = 1796760. Its totient is φ = 1543680.

The previous prime is 1668521. The next prime is 1668539. The reversal of 1668533 is 3358661.

It can be written as a sum of positive squares in 4 ways, for example, as 465124 + 1203409 = 682^2 + 1097^2 .

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 1668533 - 2⁴ = 1668517 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1668533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668539) 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 7 ways as a sum of consecutive naturals, for example, 233 + ... + 1841.

It is an arithmetic number, because the mean of its divisors is an integer number (224595).

2^1668533 is an apocalyptic number.

It is an amenable number.

1668533 is a deficient number, since it is larger than the sum of its proper divisors (128227).

1668533 is a wasteful number, since it uses less digits than its factorization.

1668533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687.

The product of its digits is 12960, while the sum is 32.

The square root of 1668533 is about 1291.7170742852. The cubic root of 1668533 is about 118.6073492977.

The spelling of 1668533 in words is "one million, six hundred sixty-eight thousand, five hundred thirty-three".