656213205663 has 6 divisors (see below), whose sum is σ = 947863519304. Its totient is φ = 437475470436.

The previous prime is 656213205649. The next prime is 656213205673. The reversal of 656213205663 is 366502312656.

656213205663 is a `hidden beast` number, since 6 + 5 + 62 + 1 + 3 + 20 + 566 + 3 = 666.

It is not a de Polignac number, because 656213205663 - 2⁴ = 656213205647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656213205673) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36456289195 + ... + 36456289212.

Almost surely, 2^656213205663 is an apocalyptic number.

656213205663 is a deficient number, since it is larger than the sum of its proper divisors (291650313641).

656213205663 is a wasteful number, since it uses less digits than its factorization.

656213205663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72912578413 (or 72912578410 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 656213205663 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred five thousand, six hundred sixty-three".