217166660707 has 2 divisors, whose sum is σ = 217166660708. Its totient is φ = 217166660706.

The previous prime is 217166660687. The next prime is 217166660713. The reversal of 217166660707 is 707066661712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217166660707 is a prime.

It is a super-2 number, since 2×217166660707² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (217166660107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108583330353 + 108583330354.

It is an arithmetic number, because the mean of its divisors is an integer number (108583330354).

Almost surely, 2^217166660707 is an apocalyptic number.

217166660707 is a deficient number, since it is larger than the sum of its proper divisors (1).

217166660707 is an equidigital number, since it uses as much as digits as its factorization.

217166660707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 889056, while the sum is 49.

The spelling of 217166660707 in words is "two hundred seventeen billion, one hundred sixty-six million, six hundred sixty thousand, seven hundred seven".