643240636230343 has 12 divisors (see below), whose sum is σ = 655615061290000. Its totient is φ = 631095533430336.

The previous prime is 643240636230337. The next prime is 643240636230419. The reversal of 643240636230343 is 343032636042346.

It is a de Polignac number, because none of the positive numbers 2^k-643240636230343 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643240636236343) 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 11 ways as a sum of consecutive naturals, for example, 212681830 + ... + 215685052.

Almost surely, 2^{643240636230343} is an apocalyptic number.

643240636230343 is a deficient number, since it is larger than the sum of its proper divisors (12374425059657).

643240636230343 is an equidigital number, since it uses as much as digits as its factorization.

643240636230343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079578 (or 3079525 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 49.

The spelling of 643240636230343 in words is "six hundred forty-three trillion, two hundred forty billion, six hundred thirty-six million, two hundred thirty thousand, three hundred forty-three".