18566481 has 16 divisors (see below), whose sum is σ = 25498368. Its totient is φ = 12009600.

The previous prime is 18566459. The next prime is 18566549. The reversal of 18566481 is 18466581.

It is not a de Polignac number, because 18566481 - 2⁹ = 18565969 is a prime.

It is a super-2 number, since 2×18566481² = 689428433446722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18566441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33055 + ... + 33611.

It is an arithmetic number, because the mean of its divisors is an integer number (1593648).

Almost surely, 2^18566481 is an apocalyptic number.

It is an amenable number.

18566481 is a deficient number, since it is larger than the sum of its proper divisors (6931887).

18566481 is a wasteful number, since it uses less digits than its factorization.

18566481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872.

The product of its digits is 46080, while the sum is 39.

The square root of 18566481 is about 4308.8839622343. The cubic root of 18566481 is about 264.7950521692.

It can be divided in two parts, 185664 and 81, that added together give a triangular number (185745 = T₆₀₉).

The spelling of 18566481 in words is "eighteen million, five hundred sixty-six thousand, four hundred eighty-one".