640043358733 has 2 divisors, whose sum is σ = 640043358734. Its totient is φ = 640043358732.

The previous prime is 640043358719. The next prime is 640043358767. The reversal of 640043358733 is 337853340046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556615968489 + 83427390244 = 746067^2 + 288838^2 .

It is a cyclic number.

It is not a de Polignac number, because 640043358733 - 2⁹ = 640043358221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640043358533) 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, 320021679366 + 320021679367.

It is an arithmetic number, because the mean of its divisors is an integer number (320021679367).

Almost surely, 2^640043358733 is an apocalyptic number.

It is an amenable number.

640043358733 is a deficient number, since it is larger than the sum of its proper divisors (1).

640043358733 is an equidigital number, since it uses as much as digits as its factorization.

640043358733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 46.

Adding to 640043358733 its reverse (337853340046), we get a palindrome (977896698779).

The spelling of 640043358733 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, seven hundred thirty-three".