646682116826 has 32 divisors (see below), whose sum is σ = 1002826137600. Its totient is φ = 312438662640.

The previous prime is 646682116819. The next prime is 646682116849. The reversal of 646682116826 is 628611286646.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192520535 + ... + 192523893.

It is an arithmetic number, because the mean of its divisors is an integer number (31338316800).

Almost surely, 2^646682116826 is an apocalyptic number.

646682116826 is a deficient number, since it is larger than the sum of its proper divisors (356144020774).

646682116826 is a wasteful number, since it uses less digits than its factorization.

646682116826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7154.

The product of its digits is 7962624, while the sum is 56.

The spelling of 646682116826 in words is "six hundred forty-six billion, six hundred eighty-two million, one hundred sixteen thousand, eight hundred twenty-six".