665254211 has 2 divisors, whose sum is σ = 665254212. Its totient is φ = 665254210.

The previous prime is 665254193. The next prime is 665254223. The reversal of 665254211 is 112452566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665254211 - 2¹⁴ = 665237827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (665254241) 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, 332627105 + 332627106.

It is an arithmetic number, because the mean of its divisors is an integer number (332627106).

Almost surely, 2^665254211 is an apocalyptic number.

665254211 is a deficient number, since it is larger than the sum of its proper divisors (1).

665254211 is an equidigital number, since it uses as much as digits as its factorization.

665254211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 665254211 is about 25792.5223853736. The cubic root of 665254211 is about 872.9630816788.

The spelling of 665254211 in words is "six hundred sixty-five million, two hundred fifty-four thousand, two hundred eleven".