646682116828 has 24 divisors (see below), whose sum is σ = 1263285999360. Its totient is φ = 287110452720.

The previous prime is 646682116819. The next prime is 646682116849. The reversal of 646682116828 is 828611286646.

It is a happy number.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170897188 + ... + 170900971.

It is an arithmetic number, because the mean of its divisors is an integer number (52636916640).

Almost surely, 2^646682116828 is an apocalyptic number.

It is an amenable number.

646682116828 is a deficient number, since it is larger than the sum of its proper divisors (616603882532).

646682116828 is a wasteful number, since it uses less digits than its factorization.

646682116828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341798217 (or 341798215 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 58.

The spelling of 646682116828 in words is "six hundred forty-six billion, six hundred eighty-two million, one hundred sixteen thousand, eight hundred twenty-eight".