126666811 has 4 divisors (see below), whose sum is σ = 127444072. Its totient is φ = 125889552.

The previous prime is 126666791. The next prime is 126666821. The reversal of 126666811 is 118666621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118666621 = 3463 ⋅34267.

It is a cyclic number.

It is not a de Polignac number, because 126666811 - 2⁹ = 126666299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126666821) 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, 388386 + ... + 388711.

It is an arithmetic number, because the mean of its divisors is an integer number (31861018).

Almost surely, 2^126666811 is an apocalyptic number.

126666811 is a deficient number, since it is larger than the sum of its proper divisors (777261).

126666811 is an equidigital number, since it uses as much as digits as its factorization.

126666811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777260.

The product of its digits is 20736, while the sum is 37.

The square root of 126666811 is about 11254.6350895975. The cubic root of 126666811 is about 502.2126089471.

The spelling of 126666811 in words is "one hundred twenty-six million, six hundred sixty-six thousand, eight hundred eleven".