217161163878367 has 2 divisors, whose sum is σ = 217161163878368. Its totient is φ = 217161163878366.

The previous prime is 217161163878341. The next prime is 217161163878401. The reversal of 217161163878367 is 763878361161712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217161163878367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217161163878667) 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, 108580581939183 + 108580581939184.

It is an arithmetic number, because the mean of its divisors is an integer number (108580581939184).

Almost surely, 2^{217161163878367} is an apocalyptic number.

217161163878367 is a deficient number, since it is larger than the sum of its proper divisors (1).

217161163878367 is an equidigital number, since it uses as much as digits as its factorization.

217161163878367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 85349376, while the sum is 67.

The spelling of 217161163878367 in words is "two hundred seventeen trillion, one hundred sixty-one billion, one hundred sixty-three million, eight hundred seventy-eight thousand, three hundred sixty-seven".