656213205664 has 12 divisors (see below), whose sum is σ = 1291919748714. Its totient is φ = 328106602816.

The previous prime is 656213205649. The next prime is 656213205673. The reversal of 656213205664 is 466502312656.

It can be written as a sum of positive squares in only one way, i.e., 397429376400 + 258783829264 = 630420^2 + 508708^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253331307 + ... + 10253331370.

Almost surely, 2^656213205664 is an apocalyptic number.

It is an amenable number.

656213205664 is a deficient number, since it is larger than the sum of its proper divisors (635706543050).

656213205664 is a wasteful number, since it uses less digits than its factorization.

656213205664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20506662687 (or 20506662679 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 656213205664 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred five thousand, six hundred sixty-four".