233666 has 4 divisors (see below), whose sum is σ = 350502. Its totient is φ = 116832.

The previous prime is 233663. The next prime is 233669. The reversal of 233666 is 666332.

233666 = 134² + 135² + ... + 145².

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (233663) and next prime (233669).

It can be written as a sum of positive squares in only one way, i.e., 229441 + 4225 = 479^2 + 65^2 .

It is a d-powerful number, because it can be written as 2¹¹ + 3 + 6² + 3¹¹ + 6⁵ + 6⁶ .

It is a Curzon number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (233663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58415 + ... + 58418.

2²³³⁶⁶⁶ is an apocalyptic number.

233666 is a deficient number, since it is larger than the sum of its proper divisors (116836).

233666 is a wasteful number, since it uses less digits than its factorization.

233666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116835.

The product of its digits is 3888, while the sum is 26.

The square root of 233666 is about 483.3901116076. The cubic root of 233666 is about 61.5930685966.

Adding to 233666 its reverse (666332), we get a palindrome (899998).

The spelling of 233666 in words is "two hundred thirty-three thousand, six hundred sixty-six".