18666845 has 8 divisors (see below), whose sum is σ = 22572000. Its totient is φ = 14818960.

The previous prime is 18666839. The next prime is 18666847. The reversal of 18666845 is 54866681.

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

It is not a de Polignac number, because 18666845 - 2¹⁴ = 18650461 is a prime.

It is a super-2 number, since 2×18666845² = 696902204508050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18666796 and 18666805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18666847) 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, 13595 + ... + 14904.

It is an arithmetic number, because the mean of its divisors is an integer number (2821500).

Almost surely, 2^18666845 is an apocalyptic number.

It is an amenable number.

18666845 is a deficient number, since it is larger than the sum of its proper divisors (3905155).

18666845 is a wasteful number, since it uses less digits than its factorization.

18666845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28635.

The product of its digits is 276480, while the sum is 44.

The square root of 18666845 is about 4320.5144369623. The cubic root of 18666845 is about 265.2713252839.

The spelling of 18666845 in words is "eighteen million, six hundred sixty-six thousand, eight hundred forty-five".