18846661 has 4 divisors (see below), whose sum is σ = 18895500. Its totient is φ = 18797824.

The previous prime is 18846649. The next prime is 18846677. The reversal of 18846661 is 16664881.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13468900 + 5377761 = 3670^2 + 2319^2 .

It is a cyclic number.

It is not a de Polignac number, because 18846661 - 2¹⁹ = 18322373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18846691) 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, 23836 + ... + 24613.

It is an arithmetic number, because the mean of its divisors is an integer number (4723875).

Almost surely, 2^18846661 is an apocalyptic number.

It is an amenable number.

18846661 is a deficient number, since it is larger than the sum of its proper divisors (48839).

18846661 is an equidigital number, since it uses as much as digits as its factorization.

18846661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48838.

The product of its digits is 55296, while the sum is 40.

The square root of 18846661 is about 4341.2741217297. The cubic root of 18846661 is about 266.1203828821.

The spelling of 18846661 in words is "eighteen million, eight hundred forty-six thousand, six hundred sixty-one".