126663 has 4 divisors (see below), whose sum is σ = 168888. Its totient is φ = 84440.

The previous prime is 126653. The next prime is 126683. The reversal of 126663 is 366621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366621 = 3 ⋅122207.

It is a cyclic number.

It is not a de Polignac number, because 126663 - 2⁵ = 126631 is a prime.

It is a D-number.

126663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126613) 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, 21108 + ... + 21113.

It is an arithmetic number, because the mean of its divisors is an integer number (42222).

2¹²⁶⁶⁶³ is an apocalyptic number.

126663 is a deficient number, since it is larger than the sum of its proper divisors (42225).

126663 is an equidigital number, since it uses as much as digits as its factorization.

126663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42224.

The product of its digits is 1296, while the sum is 24.

The square root of 126663 is about 355.8974571418. The cubic root of 126663 is about 50.2207572239.

It can be divided in two parts, 126 and 663, that multiplied together give a palindrome (83538).

The spelling of 126663 in words is "one hundred twenty-six thousand, six hundred sixty-three".