668197043 has 2 divisors, whose sum is σ = 668197044. Its totient is φ = 668197042.

The previous prime is 668197027. The next prime is 668197051. The reversal of 668197043 is 340791866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668197043 - 2⁴ = 668197027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668196985 and 668197003.

It is not a weakly prime, because it can be changed into another prime (668197003) 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, 334098521 + 334098522.

It is an arithmetic number, because the mean of its divisors is an integer number (334098522).

Almost surely, 2^668197043 is an apocalyptic number.

668197043 is a deficient number, since it is larger than the sum of its proper divisors (1).

668197043 is an equidigital number, since it uses as much as digits as its factorization.

668197043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 668197043 is about 25849.5075968576. The cubic root of 668197043 is about 874.2484073292.

The spelling of 668197043 in words is "six hundred sixty-eight million, one hundred ninety-seven thousand, forty-three".