640143140443 has 4 divisors (see below), whose sum is σ = 646742554360. Its totient is φ = 633543726528.

The previous prime is 640143140401. The next prime is 640143140447. The reversal of 640143140443 is 344041341046.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-640143140443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640143140399 and 640143140408.

It is not an unprimeable number, because it can be changed into a prime (640143140447) 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 in 3 ways as a sum of consecutive naturals, for example, 3299706813 + ... + 3299707006.

It is an arithmetic number, because the mean of its divisors is an integer number (161685638590).

Almost surely, 2^640143140443 is an apocalyptic number.

640143140443 is a deficient number, since it is larger than the sum of its proper divisors (6599413917).

640143140443 is an equidigital number, since it uses as much as digits as its factorization.

640143140443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6599413916.

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 640143140443 its reverse (344041341046), we get a palindrome (984184481489).

The spelling of 640143140443 in words is "six hundred forty billion, one hundred forty-three million, one hundred forty thousand, four hundred forty-three".