668922073 has 2 divisors, whose sum is σ = 668922074. Its totient is φ = 668922072.

The previous prime is 668922047. The next prime is 668922077. The reversal of 668922073 is 370229866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571544649 + 97377424 = 23907^2 + 9868^2 .

It is a cyclic number.

It is not a de Polignac number, because 668922073 - 2¹⁷ = 668791001 is a prime.

It is not a weakly prime, because it can be changed into another prime (668922077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334461036 + 334461037.

It is an arithmetic number, because the mean of its divisors is an integer number (334461037).

Almost surely, 2^668922073 is an apocalyptic number.

It is an amenable number.

668922073 is a deficient number, since it is larger than the sum of its proper divisors (1).

668922073 is an equidigital number, since it uses as much as digits as its factorization.

668922073 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 43.

The square root of 668922073 is about 25863.5278529438. The cubic root of 668922073 is about 874.5644953312.

The spelling of 668922073 in words is "six hundred sixty-eight million, nine hundred twenty-two thousand, seventy-three".