133663 has 4 divisors (see below), whose sum is σ = 135568. Its totient is φ = 131760.

The previous prime is 133657. The next prime is 133669. The reversal of 133663 is 366331.

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 (133657) and next prime (133669).

It is a cyclic number.

It is not a de Polignac number, because 133663 - 2⁵ = 133631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843 + ... + 988.

It is an arithmetic number, because the mean of its divisors is an integer number (33892).

2¹³³⁶⁶³ is an apocalyptic number.

133663 is a deficient number, since it is larger than the sum of its proper divisors (1905).

133663 is an equidigital number, since it uses as much as digits as its factorization.

133663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904.

The product of its digits is 972, while the sum is 22.

The square root of 133663 is about 365.5995076583. The cubic root of 133663 is about 51.1293652854.

Adding to 133663 its reverse (366331), we get a palindrome (499994).

The spelling of 133663 in words is "one hundred thirty-three thousand, six hundred sixty-three".