216370066777 has 2 divisors, whose sum is σ = 216370066778. Its totient is φ = 216370066776.

The previous prime is 216370066771. The next prime is 216370066811. The reversal of 216370066777 is 777660073612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116819720521 + 99550346256 = 341789^2 + 315516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216370066777 is a prime.

It is not a weakly prime, because it can be changed into another prime (216370066771) 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, 108185033388 + 108185033389.

It is an arithmetic number, because the mean of its divisors is an integer number (108185033389).

Almost surely, 2^216370066777 is an apocalyptic number.

It is an amenable number.

216370066777 is a deficient number, since it is larger than the sum of its proper divisors (1).

216370066777 is an equidigital number, since it uses as much as digits as its factorization.

216370066777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3111696, while the sum is 52.

The spelling of 216370066777 in words is "two hundred sixteen billion, three hundred seventy million, sixty-six thousand, seven hundred seventy-seven".