643474313421 has 4 divisors (see below), whose sum is σ = 857965751232. Its totient is φ = 428982875612.

The previous prime is 643474313411. The next prime is 643474313459. The reversal of 643474313421 is 124313474346.

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 643474313421 - 2²⁷ = 643340095693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643474313411) 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 3 ways as a sum of consecutive naturals, for example, 107245718901 + ... + 107245718906.

It is an arithmetic number, because the mean of its divisors is an integer number (214491437808).

Almost surely, 2^643474313421 is an apocalyptic number.

It is an amenable number.

643474313421 is a deficient number, since it is larger than the sum of its proper divisors (214491437811).

643474313421 is a wasteful number, since it uses less digits than its factorization.

643474313421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214491437810.

The product of its digits is 580608, while the sum is 42.

Adding to 643474313421 its reverse (124313474346), we get a palindrome (767787787767).

The spelling of 643474313421 in words is "six hundred forty-three billion, four hundred seventy-four million, three hundred thirteen thousand, four hundred twenty-one".