126666669 has 16 divisors (see below), whose sum is σ = 172065600. Its totient is φ = 82870656.

The previous prime is 126666667. The next prime is 126666679. The reversal of 126666669 is 966666621.

It is a happy number.

It is not a de Polignac number, because 126666669 - 2¹ = 126666667 is a prime.

It is a super-2 number, since 2×126666669² = 32088890071111122, which contains 22 as substring.

It is a plaindrome in base 10.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 35407 + ... + 38819.

It is an arithmetic number, because the mean of its divisors is an integer number (10754100).

Almost surely, 2^126666669 is an apocalyptic number.

It is an amenable number.

126666669 is a deficient number, since it is larger than the sum of its proper divisors (45398931).

126666669 is a wasteful number, since it uses less digits than its factorization.

126666669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644.

The product of its digits is 839808, while the sum is 48.

The square root of 126666669 is about 11254.6287810838. The cubic root of 126666669 is about 502.2124212783.

Subtracting from 126666669 its sum of digits (48), we obtain a palindrome (126666621).

The spelling of 126666669 in words is "one hundred twenty-six million, six hundred sixty-six thousand, six hundred sixty-nine".