643434202434347 has 4 divisors (see below), whose sum is σ = 644058289925616. Its totient is φ = 642810114943080.

The previous prime is 643434202434313. The next prime is 643434202434377. The reversal of 643434202434347 is 743434202434346.

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

It is a cyclic number.

It is not a de Polignac number, because 643434202434347 - 2²⁶ = 643434135325483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643434202434377) 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, 312043744088 + ... + 312043746149.

It is an arithmetic number, because the mean of its divisors is an integer number (161014572481404).

Almost surely, 2^{643434202434347} is an apocalyptic number.

643434202434347 is a deficient number, since it is larger than the sum of its proper divisors (624087491269).

643434202434347 is a wasteful number, since it uses less digits than its factorization.

643434202434347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624087491268.

The product of its (nonzero) digits is 55738368, while the sum is 53.

Subtracting 643434202434347 from its reverse (743434202434346), we obtain a palindrome (99999999999999).

The spelling of 643434202434347 in words is "six hundred forty-three trillion, four hundred thirty-four billion, two hundred two million, four hundred thirty-four thousand, three hundred forty-seven".