666228811 has 2 divisors, whose sum is σ = 666228812. Its totient is φ = 666228810.

The previous prime is 666228809. The next prime is 666228817. The reversal of 666228811 is 118822666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666228811 - 2¹ = 666228809 is a prime.

Together with 666228809, it forms a pair of twin primes.

It is a zygodrome in base 10.

It is not a weakly prime, because it can be changed into another prime (666228817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333114405 + 333114406.

It is an arithmetic number, because the mean of its divisors is an integer number (333114406).

Almost surely, 2^666228811 is an apocalyptic number.

666228811 is a deficient number, since it is larger than the sum of its proper divisors (1).

666228811 is an equidigital number, since it uses as much as digits as its factorization.

666228811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 666228811 is about 25811.4085435104. The cubic root of 666228811 is about 873.3891717724.

The spelling of 666228811 in words is "six hundred sixty-six million, two hundred twenty-eight thousand, eight hundred eleven".