6555957856663 has 2 divisors, whose sum is σ = 6555957856664. Its totient is φ = 6555957856662.

The previous prime is 6555957856601. The next prime is 6555957856783. The reversal of 6555957856663 is 3666587595556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6555957856663 - 2⁴¹ = 4356934601111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6555957856663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6555957856963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277978928331 + 3277978928332.

It is an arithmetic number, because the mean of its divisors is an integer number (3277978928332).

Almost surely, 2^{6555957856663} is an apocalyptic number.

6555957856663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555957856663 is an equidigital number, since it uses as much as digits as its factorization.

6555957856663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6123600000, while the sum is 76.

The spelling of 6555957856663 in words is "six trillion, five hundred fifty-five billion, nine hundred fifty-seven million, eight hundred fifty-six thousand, six hundred sixty-three".