1666363 has 8 divisors (see below), whose sum is σ = 1728720. Its totient is φ = 1605120.

The previous prime is 1666361. The next prime is 1666387. The reversal of 1666363 is 3636661.

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 1666363 - 2¹ = 1666361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666361) 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, 3768 + ... + 4186.

It is an arithmetic number, because the mean of its divisors is an integer number (216090).

2^1666363 is an apocalyptic number.

1666363 is a deficient number, since it is larger than the sum of its proper divisors (62357).

1666363 is an equidigital number, since it uses as much as digits as its factorization.

1666363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557.

The product of its digits is 11664, while the sum is 31.

The square root of 1666363 is about 1290.8768337839. The cubic root of 1666363 is about 118.5559089794. Note that the first 3 decimals are identical.

The spelling of 1666363 in words is "one million, six hundred sixty-six thousand, three hundred sixty-three".