646768863122 has 6 divisors (see below), whose sum is σ = 970155000693. Its totient is φ = 323383862892.

The previous prime is 646768863121. The next prime is 646768863319. The reversal of 646768863122 is 221368867646.

It can be written as a sum of positive squares in 2 ways, for example, as 561598861201 + 85170001921 = 749399^2 + 291839^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=568669.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646768863121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 853004 + ... + 1421672.

Almost surely, 2^646768863122 is an apocalyptic number.

646768863122 is a deficient number, since it is larger than the sum of its proper divisors (323386137571).

646768863122 is an frugal number, since it uses more digits than its factorization.

646768863122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137340 (or 568671 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 59.

The spelling of 646768863122 in words is "six hundred forty-six billion, seven hundred sixty-eight million, eight hundred sixty-three thousand, one hundred twenty-two".