18416661 has 8 divisors (see below), whose sum is σ = 26000064. Its totient is φ = 11555520.

The previous prime is 18416641. The next prime is 18416663. The reversal of 18416661 is 16661481.

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

It is not a de Polignac number, because 18416661 - 2⁶ = 18416597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18416663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180505 + ... + 180606.

It is an arithmetic number, because the mean of its divisors is an integer number (3250008).

Almost surely, 2^18416661 is an apocalyptic number.

It is an amenable number.

18416661 is a deficient number, since it is larger than the sum of its proper divisors (7583403).

18416661 is a wasteful number, since it uses less digits than its factorization.

18416661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361131.

The product of its digits is 6912, while the sum is 33.

The square root of 18416661 is about 4291.4637363026. The cubic root of 18416661 is about 264.0808837335.

The spelling of 18416661 in words is "eighteen million, four hundred sixteen thousand, six hundred sixty-one".