646773846056 has 16 divisors (see below), whose sum is σ = 1305985650900. Its totient is φ = 298511005824.

The previous prime is 646773846053. The next prime is 646773846071. The reversal of 646773846056 is 650648377646.

It can be written as a sum of positive squares in 2 ways, for example, as 641066043556 + 5707802500 = 800666^2 + 75550^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646773846056.

It is not an unprimeable number, because it can be changed into a prime (646773846053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3109489541 + ... + 3109489748.

Almost surely, 2^646773846056 is an apocalyptic number.

It is an amenable number.

646773846056 is an abundant number, since it is smaller than the sum of its proper divisors (659211804844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646773846056 is a wasteful number, since it uses less digits than its factorization.

646773846056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6218979308 (or 6218979304 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 62.

The spelling of 646773846056 in words is "six hundred forty-six billion, seven hundred seventy-three million, eight hundred forty-six thousand, fifty-six".