646343768791 has 12 divisors (see below), whose sum is σ = 769354616712. Its totient is φ = 541125013968.

The previous prime is 646343768743. The next prime is 646343768813. The reversal of 646343768791 is 197867343646.

It is not a de Polignac number, because 646343768791 - 2²¹ = 646341671639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646343868791) 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, 153378000 + ... + 153382213.

It is an arithmetic number, because the mean of its divisors is an integer number (64112884726).

Almost surely, 2^646343768791 is an apocalyptic number.

646343768791 is a deficient number, since it is larger than the sum of its proper divisors (123010847921).

646343768791 is a wasteful number, since it uses less digits than its factorization.

646343768791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306760270 (or 306760263 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 64.

The spelling of 646343768791 in words is "six hundred forty-six billion, three hundred forty-three million, seven hundred sixty-eight thousand, seven hundred ninety-one".