126666666 has 108 divisors (see below), whose sum is σ = 333196578. Its totient is φ = 36006768.

The previous prime is 126666641. The next prime is 126666667. The reversal of 126666666 is 666666621.

It can be written as a sum of positive squares in only one way, i.e., 72335025 + 54331641 = 8505^2 + 7371^2 .

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

126666666 is a modest number, since divided by 66666 gives 1266 as remainder.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (126666667) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 642880 + ... + 643076.

Almost surely, 2^126666666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126666666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166598289).

126666666 is an abundant number, since it is smaller than the sum of its proper divisors (206529912).

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

126666666 is an frugal number, since it uses more digits than its factorization.

126666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 209 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 126666666 is about 11254.6286478053. The cubic root of 126666666 is about 502.2124173135.

Subtracting from 126666666 its sum of digits (45), we obtain a palindrome (126666621).

The spelling of 126666666 in words is "one hundred twenty-six million, six hundred sixty-six thousand, six hundred sixty-six".