668328911 has 2 divisors, whose sum is σ = 668328912. Its totient is φ = 668328910.

The previous prime is 668328889. The next prime is 668328923. The reversal of 668328911 is 119823866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668328911 - 2¹⁸ = 668066767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668328611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334164455 + 334164456.

It is an arithmetic number, because the mean of its divisors is an integer number (334164456).

Almost surely, 2^668328911 is an apocalyptic number.

668328911 is a deficient number, since it is larger than the sum of its proper divisors (1).

668328911 is an equidigital number, since it uses as much as digits as its factorization.

668328911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 668328911 is about 25852.0581579108. The cubic root of 668328911 is about 874.3059142214.

The spelling of 668328911 in words is "six hundred sixty-eight million, three hundred twenty-eight thousand, nine hundred eleven".