18226663 has 8 divisors (see below), whose sum is σ = 22432928. Its totient is φ = 14421024.

The previous prime is 18226661. The next prime is 18226679. The reversal of 18226663 is 36662281.

It is a happy number.

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 18226663 - 2¹ = 18226661 is a prime.

It is a super-2 number, since 2×18226663² = 664422488231138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18226661) 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, 100056 + ... + 100237.

It is an arithmetic number, because the mean of its divisors is an integer number (2804116).

Almost surely, 2^18226663 is an apocalyptic number.

18226663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18226663 is a deficient number, since it is larger than the sum of its proper divisors (4206265).

18226663 is a wasteful number, since it uses less digits than its factorization.

18226663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200313.

The product of its digits is 20736, while the sum is 34.

The square root of 18226663 is about 4269.2696096639. The cubic root of 18226663 is about 263.1696005439.

It can be divided in two parts, 182266 and 63, that added together give a square (182329 = 427²).

The spelling of 18226663 in words is "eighteen million, two hundred twenty-six thousand, six hundred sixty-three".