55166852205217 has 2 divisors, whose sum is σ = 55166852205218. Its totient is φ = 55166852205216.

The previous prime is 55166852205173. The next prime is 55166852205221. The reversal of 55166852205217 is 71250225866155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55066135470336 + 100716734881 = 7420656^2 + 317359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55166852205217 is a prime.

It is not a weakly prime, because it can be changed into another prime (55166852905217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27583426102608 + 27583426102609.

It is an arithmetic number, because the mean of its divisors is an integer number (27583426102609).

Almost surely, 2^{55166852205217} is an apocalyptic number.

It is an amenable number.

55166852205217 is a deficient number, since it is larger than the sum of its proper divisors (1).

55166852205217 is an equidigital number, since it uses as much as digits as its factorization.

55166852205217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080000, while the sum is 55.

The spelling of 55166852205217 in words is "fifty-five trillion, one hundred sixty-six billion, eight hundred fifty-two million, two hundred five thousand, two hundred seventeen".