1666063 has 4 divisors (see below), whose sum is σ = 1904080. Its totient is φ = 1428048.

The previous prime is 1666061. The next prime is 1666081. The reversal of 1666063 is 3606661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1666063 - 2¹ = 1666061 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666061) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 118998 + ... + 119011.

It is an arithmetic number, because the mean of its divisors is an integer number (476020).

2^1666063 is an apocalyptic number.

1666063 is a deficient number, since it is larger than the sum of its proper divisors (238017).

1666063 is an equidigital number, since it uses as much as digits as its factorization.

1666063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238016.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1666063 is about 1290.7606284668. The cubic root of 1666063 is about 118.5487939016.

The spelling of 1666063 in words is "one million, six hundred sixty-six thousand, sixty-three".