668928433 has 2 divisors, whose sum is σ = 668928434. Its totient is φ = 668928432.

The previous prime is 668928401. The next prime is 668928451. The reversal of 668928433 is 334829866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 448465329 + 220463104 = 21177^2 + 14848^2 .

It is a cyclic number.

It is not a de Polignac number, because 668928433 - 2⁵ = 668928401 is a prime.

It is not a weakly prime, because it can be changed into another prime (668928493) 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, 334464216 + 334464217.

It is an arithmetic number, because the mean of its divisors is an integer number (334464217).

Almost surely, 2^668928433 is an apocalyptic number.

It is an amenable number.

668928433 is a deficient number, since it is larger than the sum of its proper divisors (1).

668928433 is an equidigital number, since it uses as much as digits as its factorization.

668928433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 49.

The square root of 668928433 is about 25863.6508057157. The cubic root of 668928433 is about 874.5672670604.

The spelling of 668928433 in words is "six hundred sixty-eight million, nine hundred twenty-eight thousand, four hundred thirty-three".