643431505134347 has 8 divisors (see below), whose sum is σ = 646709155018080. Its totient is φ = 640158878471040.

The previous prime is 643431505134269. The next prime is 643431505134361. The reversal of 643431505134347 is 743431505134346.

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

It is a cyclic number.

It is not a de Polignac number, because 643431505134347 - 2¹⁴ = 643431505117963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643431505137347) 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 7 ways as a sum of consecutive naturals, for example, 1255548272 + ... + 1256060637.

It is an arithmetic number, because the mean of its divisors is an integer number (80838644377260).

Almost surely, 2^{643431505134347} is an apocalyptic number.

643431505134347 is a deficient number, since it is larger than the sum of its proper divisors (3277649883733).

643431505134347 is a wasteful number, since it uses less digits than its factorization.

643431505134347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511610213.

The product of its (nonzero) digits is 21772800, while the sum is 53.

Subtracting 643431505134347 from its reverse (743431505134346), we obtain a palindrome (99999999999999).

The spelling of 643431505134347 in words is "six hundred forty-three trillion, four hundred thirty-one billion, five hundred five million, one hundred thirty-four thousand, three hundred forty-seven".