18661411 has 4 divisors (see below), whose sum is σ = 19263424. Its totient is φ = 18059400.

The previous prime is 18661387. The next prime is 18661417. The reversal of 18661411 is 11416681.

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 18661411 - 2⁹ = 18660899 is a prime.

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 18661411.

It is not an unprimeable number, because it can be changed into a prime (18661417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300960 + ... + 301021.

It is an arithmetic number, because the mean of its divisors is an integer number (4815856).

Almost surely, 2^18661411 is an apocalyptic number.

18661411 is a deficient number, since it is larger than the sum of its proper divisors (602013).

18661411 is an equidigital number, since it uses as much as digits as its factorization.

18661411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602012.

The product of its digits is 1152, while the sum is 28.

The square root of 18661411 is about 4319.8855308908. The cubic root of 18661411 is about 265.2455822392.

The spelling of 18661411 in words is "eighteen million, six hundred sixty-one thousand, four hundred eleven".