656555043653953 has 2 divisors, whose sum is σ = 656555043653954. Its totient is φ = 656555043653952.

The previous prime is 656555043653909. The next prime is 656555043654031. The reversal of 656555043653953 is 359356340555656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359237891559184 + 297317152094769 = 18953572^2 + 17242887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656555043653953 is a prime.

It is a super-2 number, since 2×656555043653953² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656555043659953) by changing a digit.

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, 328277521826976 + 328277521826977.

It is an arithmetic number, because the mean of its divisors is an integer number (328277521826977).

Almost surely, 2^{656555043653953} is an apocalyptic number.

It is an amenable number.

656555043653953 is a deficient number, since it is larger than the sum of its proper divisors (1).

656555043653953 is an equidigital number, since it uses as much as digits as its factorization.

656555043653953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3280500000, while the sum is 70.

The spelling of 656555043653953 in words is "six hundred fifty-six trillion, five hundred fifty-five billion, forty-three million, six hundred fifty-three thousand, nine hundred fifty-three".