640043342383 has 2 divisors, whose sum is σ = 640043342384. Its totient is φ = 640043342382.

The previous prime is 640043342377. The next prime is 640043342417. The reversal of 640043342383 is 383243340046.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640043342383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640043342303) 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, 320021671191 + 320021671192.

It is an arithmetic number, because the mean of its divisors is an integer number (320021671192).

Almost surely, 2^640043342383 is an apocalyptic number.

640043342383 is a deficient number, since it is larger than the sum of its proper divisors (1).

640043342383 is an equidigital number, since it uses as much as digits as its factorization.

640043342383 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 40.

The spelling of 640043342383 in words is "six hundred forty billion, forty-three million, three hundred forty-two thousand, three hundred eighty-three".