646063043656 has 16 divisors (see below), whose sum is σ = 1211378580540. Its totient is φ = 323028755520.

The previous prime is 646063043603. The next prime is 646063043677. The reversal of 646063043656 is 656340360646.

It can be written as a sum of positive squares in 2 ways, for example, as 638826138756 + 7236904900 = 799266^2 + 85070^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918850 + ... + 1461646.

Almost surely, 2^646063043656 is an apocalyptic number.

It is an amenable number.

646063043656 is a deficient number, since it is larger than the sum of its proper divisors (565315536884).

646063043656 is a wasteful number, since it uses less digits than its factorization.

646063043656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691584 (or 691580 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 49.

The spelling of 646063043656 in words is "six hundred forty-six billion, sixty-three million, forty-three thousand, six hundred fifty-six".