18668667 has 8 divisors (see below), whose sum is σ = 25361424. Its totient is φ = 12210848.

The previous prime is 18668641. The next prime is 18668687. The reversal of 18668667 is 76686681.

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

It is a cyclic number.

It is not a de Polignac number, because 18668667 - 2¹⁰ = 18667643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18668687) 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, 58548 + ... + 58865.

It is an arithmetic number, because the mean of its divisors is an integer number (3170178).

Almost surely, 2^18668667 is an apocalyptic number.

18668667 is a deficient number, since it is larger than the sum of its proper divisors (6692757).

18668667 is a wasteful number, since it uses less digits than its factorization.

18668667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117469.

The product of its digits is 580608, while the sum is 48.

The square root of 18668667 is about 4320.7252863379. The cubic root of 18668667 is about 265.2799557127.

It can be divided in two parts, 1 and 8668667, that added together give a palindrome (8668668).

The spelling of 18668667 in words is "eighteen million, six hundred sixty-eight thousand, six hundred sixty-seven".