66855035161 has 2 divisors, whose sum is σ = 66855035162. Its totient is φ = 66855035160.

The previous prime is 66855035113. The next prime is 66855035173. The reversal of 66855035161 is 16153055866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62943283225 + 3911751936 = 250885^2 + 62544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66855035161 is a prime.

It is not a weakly prime, because it can be changed into another prime (66852035161) 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, 33427517580 + 33427517581.

It is an arithmetic number, because the mean of its divisors is an integer number (33427517581).

Almost surely, 2^66855035161 is an apocalyptic number.

It is an amenable number.

66855035161 is a deficient number, since it is larger than the sum of its proper divisors (1).

66855035161 is an equidigital number, since it uses as much as digits as its factorization.

66855035161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 66855035161 in words is "sixty-six billion, eight hundred fifty-five million, thirty-five thousand, one hundred sixty-one".