643324041423 has 64 divisors (see below), whose sum is σ = 1131096637440. Its totient is φ = 353624421600.

The previous prime is 643324041413. The next prime is 643324041427. The reversal of 643324041423 is 324140423346.

643324041423 is a `hidden beast` number, since 643 + 3 + 2 + 4 + 0 + 4 + 1 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 643324041423 - 2⁸ = 643324041167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643324041427) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 649708 + ... + 1307198.

It is an arithmetic number, because the mean of its divisors is an integer number (17673384960).

Almost surely, 2^643324041423 is an apocalyptic number.

643324041423 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

643324041423 is a deficient number, since it is larger than the sum of its proper divisors (487772596017).

643324041423 is a wasteful number, since it uses less digits than its factorization.

643324041423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657705 (or 657699 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 36.

Adding to 643324041423 its reverse (324140423346), we get a palindrome (967464464769).

The spelling of 643324041423 in words is "six hundred forty-three billion, three hundred twenty-four million, forty-one thousand, four hundred twenty-three".