656213205646 has 64 divisors (see below), whose sum is σ = 1040739840000. Its totient is φ = 309884020992.

The previous prime is 656213205533. The next prime is 656213205647. The reversal of 656213205646 is 646502312656.

It is a junction number, because it is equal to n+sod(n) for n = 656213205596 and 656213205605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656213205647) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 457928946 + ... + 457930378.

It is an arithmetic number, because the mean of its divisors is an integer number (16261560000).

Almost surely, 2^656213205646 is an apocalyptic number.

656213205646 is a deficient number, since it is larger than the sum of its proper divisors (384526634354).

656213205646 is a wasteful number, since it uses less digits than its factorization.

656213205646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401.

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

The spelling of 656213205646 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred five thousand, six hundred forty-six".