2018661 has 8 divisors (see below), whose sum is σ = 2784480. Its totient is φ = 1299312.

The previous prime is 2018651. The next prime is 2018663. The reversal of 2018661 is 1668102.

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

It is not a de Polignac number, because 2018661 - 2⁵ = 2018629 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 11515 + ... + 11688.

It is an arithmetic number, because the mean of its divisors is an integer number (348060).

2^2018661 is an apocalyptic number.

It is an amenable number.

2018661 is a deficient number, since it is larger than the sum of its proper divisors (765819).

2018661 is a wasteful number, since it uses less digits than its factorization.

2018661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23235.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2018661 is about 1420.7959037103. The cubic root of 2018661 is about 126.3827489743.

It can be divided in two parts, 20 and 18661, that added together give a palindrome (18681).

The spelling of 2018661 in words is "two million, eighteen thousand, six hundred sixty-one".