646351323656 has 32 divisors (see below), whose sum is σ = 1224357255000. Its totient is φ = 319858406400.

The previous prime is 646351323637. The next prime is 646351323689. The reversal of 646351323656 is 656323153646.

It can be written as a sum of positive squares in 4 ways, for example, as 562695016900 + 83656306756 = 750130^2 + 289234^2 .

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, 2075696 + ... + 2366688.

Almost surely, 2^646351323656 is an apocalyptic number.

It is an amenable number.

646351323656 is a deficient number, since it is larger than the sum of its proper divisors (578005931344).

646351323656 is a wasteful number, since it uses less digits than its factorization.

646351323656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293849 (or 293845 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 50.

The spelling of 646351323656 in words is "six hundred forty-six billion, three hundred fifty-one million, three hundred twenty-three thousand, six hundred fifty-six".