643240317013 has 12 divisors (see below), whose sum is σ = 775859316960. Its totient is φ = 522330480936.

The previous prime is 643240317011. The next prime is 643240317043. The reversal of 643240317013 is 310713042346.

It is not a de Polignac number, because 643240317013 - 2¹ = 643240317011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643240317013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643240317011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127270983 + ... + 127276036.

It is an arithmetic number, because the mean of its divisors is an integer number (64654943080).

Almost surely, 2^643240317013 is an apocalyptic number.

It is an amenable number.

643240317013 is a deficient number, since it is larger than the sum of its proper divisors (132618999947).

643240317013 is a wasteful number, since it uses less digits than its factorization.

643240317013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254547064 (or 254547045 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

Adding to 643240317013 its reverse (310713042346), we get a palindrome (953953359359).

The spelling of 643240317013 in words is "six hundred forty-three billion, two hundred forty million, three hundred seventeen thousand, thirteen".