643140445611 has 4 divisors (see below), whose sum is σ = 857520594152. Its totient is φ = 428760297072.

The previous prime is 643140445579. The next prime is 643140445669. The reversal of 643140445611 is 116544041346.

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

It is not a de Polignac number, because 643140445611 - 2⁵ = 643140445579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643140445611.

It is not an unprimeable number, because it can be changed into a prime (643142445611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107190074266 + ... + 107190074271.

It is an arithmetic number, because the mean of its divisors is an integer number (214380148538).

Almost surely, 2^643140445611 is an apocalyptic number.

643140445611 is a deficient number, since it is larger than the sum of its proper divisors (214380148541).

643140445611 is a wasteful number, since it uses less digits than its factorization.

643140445611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214380148540.

The product of its (nonzero) digits is 138240, while the sum is 39.

Adding to 643140445611 its reverse (116544041346), we get a palindrome (759684486957).

The spelling of 643140445611 in words is "six hundred forty-three billion, one hundred forty million, four hundred forty-five thousand, six hundred eleven".