668143733 has 2 divisors, whose sum is σ = 668143734. Its totient is φ = 668143732.

The previous prime is 668143727. The next prime is 668143769. The reversal of 668143733 is 337341866.

668143733 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490268164 + 177875569 = 22142^2 + 13337^2 .

It is a cyclic number.

It is not a de Polignac number, because 668143733 - 2⁸ = 668143477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668143783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334071866 + 334071867.

It is an arithmetic number, because the mean of its divisors is an integer number (334071867).

Almost surely, 2^668143733 is an apocalyptic number.

It is an amenable number.

668143733 is a deficient number, since it is larger than the sum of its proper divisors (1).

668143733 is an equidigital number, since it uses as much as digits as its factorization.

668143733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 41.

The square root of 668143733 is about 25848.4764154486. The cubic root of 668143733 is about 874.2251569908.

The spelling of 668143733 in words is "six hundred sixty-eight million, one hundred forty-three thousand, seven hundred thirty-three".