2018666 has 8 divisors (see below), whose sum is σ = 3260964. Its totient is φ = 931680.

The previous prime is 2018663. The next prime is 2018671. The reversal of 2018666 is 6668102.

It can be written as a sum of positive squares in 2 ways, for example, as 1615441 + 403225 = 1271^2 + 635^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2018663) 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 3 ways as a sum of consecutive naturals, for example, 38795 + ... + 38846.

2^2018666 is an apocalyptic number.

2018666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2018666 is a deficient number, since it is larger than the sum of its proper divisors (1242298).

2018666 is a wasteful number, since it uses less digits than its factorization.

2018666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77656.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 2018666 is about 1420.7976632864. The cubic root of 2018666 is about 126.3828533196.

The spelling of 2018666 in words is "two million, eighteen thousand, six hundred sixty-six".