126666 has 24 divisors (see below), whose sum is σ = 284544. Its totient is φ = 40680.

The previous prime is 126653. The next prime is 126683. The reversal of 126666 is 666621.

It is a nude number because it is divisible by every one of its digits.

126666 is a modest number, since divided by 666 gives 126 as remainder.

It is a plaindrome in base 10.

It is an unprimeable number.

126666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 445 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (11856).

2¹²⁶⁶⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142272).

126666 is an abundant number, since it is smaller than the sum of its proper divisors (157878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126666 is a wasteful number, since it uses less digits than its factorization.

126666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 263 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 126666 is about 355.9016718140. The cubic root of 126666 is about 50.2211537119.

The spelling of 126666 in words is "one hundred twenty-six thousand, six hundred sixty-six".