656213205647 has 2 divisors, whose sum is σ = 656213205648. Its totient is φ = 656213205646.

The previous prime is 656213205533. The next prime is 656213205649. The reversal of 656213205647 is 746502312656.

656213205647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656213205647 is a prime.

Together with 656213205649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656213205649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328106602823 + 328106602824.

It is an arithmetic number, because the mean of its divisors is an integer number (328106602824).

Almost surely, 2^656213205647 is an apocalyptic number.

656213205647 is a deficient number, since it is larger than the sum of its proper divisors (1).

656213205647 is an equidigital number, since it uses as much as digits as its factorization.

656213205647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 656213205647 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred five thousand, six hundred forty-seven".