18666669 has 16 divisors (see below), whose sum is σ = 28871168. Its totient is φ = 10506672.

The previous prime is 18666667. The next prime is 18666677. The reversal of 18666669 is 96666681.

It is a happy number.

It is not a de Polignac number, because 18666669 - 2¹ = 18666667 is a prime.

It is a super-2 number, since 2×18666669² = 696889063111122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18666667) 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 15 ways as a sum of consecutive naturals, for example, 5227 + ... + 8040.

It is an arithmetic number, because the mean of its divisors is an integer number (1804448).

Almost surely, 2^18666669 is an apocalyptic number.

It is an amenable number.

18666669 is a deficient number, since it is larger than the sum of its proper divisors (10204499).

18666669 is a wasteful number, since it uses less digits than its factorization.

18666669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13344.

The product of its digits is 559872, while the sum is 48.

The square root of 18666669 is about 4320.4940689694. The cubic root of 18666669 is about 265.2704915794.

The spelling of 18666669 in words is "eighteen million, six hundred sixty-six thousand, six hundred sixty-nine".