643312753 has 4 divisors (see below), whose sum is σ = 652373568. Its totient is φ = 634251940.

The previous prime is 643312751. The next prime is 643312757. The reversal of 643312753 is 357213346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643312753 - 2¹ = 643312751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643312751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4530301 + ... + 4530442.

It is an arithmetic number, because the mean of its divisors is an integer number (163093392).

Almost surely, 2^643312753 is an apocalyptic number.

It is an amenable number.

643312753 is a deficient number, since it is larger than the sum of its proper divisors (9060815).

643312753 is an equidigital number, since it uses as much as digits as its factorization.

643312753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9060814.

The product of its digits is 45360, while the sum is 34.

The square root of 643312753 is about 25363.6108036691. The cubic root of 643312753 is about 863.2582157959.

The spelling of 643312753 in words is "six hundred forty-three million, three hundred twelve thousand, seven hundred fifty-three".