643140734353 has 8 divisors (see below), whose sum is σ = 699753441128. Its totient is φ = 587548076544.

The previous prime is 643140734267. The next prime is 643140734359. The reversal of 643140734353 is 353437041346.

It can be written as a sum of positive squares in 4 ways, for example, as 2295655569 + 640845078784 = 47913^2 + 800528^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-643140734353 is a prime.

It is a super-2 number, since 2×643140734353² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643140734359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255010926 + ... + 255013447.

It is an arithmetic number, because the mean of its divisors is an integer number (87469180141).

Almost surely, 2^643140734353 is an apocalyptic number.

It is an amenable number.

643140734353 is a deficient number, since it is larger than the sum of its proper divisors (56612706775).

643140734353 is a wasteful number, since it uses less digits than its factorization.

643140734353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510024483.

The product of its (nonzero) digits is 1088640, while the sum is 43.

Adding to 643140734353 its reverse (353437041346), we get a palindrome (996577775699).

The spelling of 643140734353 in words is "six hundred forty-three billion, one hundred forty million, seven hundred thirty-four thousand, three hundred fifty-three".