646708624634 has 12 divisors (see below), whose sum is σ = 1030482082734. Its totient is φ = 304333470144.

The previous prime is 646708624531. The next prime is 646708624669. The reversal of 646708624634 is 436426807646.

It can be written as a sum of positive squares in 3 ways, for example, as 642266002225 + 4442622409 = 801415^2 + 66653^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646708624634.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 559435949 + ... + 559437104.

Almost surely, 2^646708624634 is an apocalyptic number.

646708624634 is a deficient number, since it is larger than the sum of its proper divisors (383773458100).

646708624634 is a wasteful number, since it uses less digits than its factorization.

646708624634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118873089 (or 1118873072 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 56.

The spelling of 646708624634 in words is "six hundred forty-six billion, seven hundred eight million, six hundred twenty-four thousand, six hundred thirty-four".