656213205673 has 2 divisors, whose sum is σ = 656213205674. Its totient is φ = 656213205672.

The previous prime is 656213205649. The next prime is 656213205701. The reversal of 656213205673 is 376502312656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 498955751424 + 157257454249 = 706368^2 + 396557^2 .

It is a cyclic number.

It is not a de Polignac number, because 656213205673 - 2²¹ = 656211108521 is a prime.

It is not a weakly prime, because it can be changed into another prime (656213205173) 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 as a sum of consecutive naturals, namely, 328106602836 + 328106602837.

It is an arithmetic number, because the mean of its divisors is an integer number (328106602837).

Almost surely, 2^656213205673 is an apocalyptic number.

It is an amenable number.

656213205673 is a deficient number, since it is larger than the sum of its proper divisors (1).

656213205673 is an equidigital number, since it uses as much as digits as its factorization.

656213205673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 46.

The spelling of 656213205673 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred five thousand, six hundred seventy-three".