640043358693 has 16 divisors (see below), whose sum is σ = 868968172800. Its totient is φ = 418966741440.

The previous prime is 640043358679. The next prime is 640043358709. The reversal of 640043358693 is 396853340046.

It is a happy number.

It is not a de Polignac number, because 640043358693 - 2⁶ = 640043358629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640043358613) 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 in 15 ways as a sum of consecutive naturals, for example, 7417338 + ... + 7503131.

It is an arithmetic number, because the mean of its divisors is an integer number (54310510800).

Almost surely, 2^640043358693 is an apocalyptic number.

It is an amenable number.

640043358693 is a deficient number, since it is larger than the sum of its proper divisors (228924814107).

640043358693 is a wasteful number, since it uses less digits than its factorization.

640043358693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14920732.

The product of its (nonzero) digits is 5598720, while the sum is 51.

The spelling of 640043358693 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, six hundred ninety-three".