18668633 has 4 divisors (see below), whose sum is σ = 18695040. Its totient is φ = 18642228.

The previous prime is 18668599. The next prime is 18668641. The reversal of 18668633 is 33686681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33686681 = 7 ⋅4812383.

It is a cyclic number.

It is not a de Polignac number, because 18668633 - 2¹⁰ = 18667609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18668693) 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 3 ways as a sum of consecutive naturals, for example, 12113 + ... + 13566.

It is an arithmetic number, because the mean of its divisors is an integer number (4673760).

Almost surely, 2^18668633 is an apocalyptic number.

It is an amenable number.

18668633 is a deficient number, since it is larger than the sum of its proper divisors (26407).

18668633 is an equidigital number, since it uses as much as digits as its factorization.

18668633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26406.

The product of its digits is 124416, while the sum is 41.

The square root of 18668633 is about 4320.7213518115. The cubic root of 18668633 is about 265.2797946670.

The spelling of 18668633 in words is "eighteen million, six hundred sixty-eight thousand, six hundred thirty-three".