263354664217 has 2 divisors, whose sum is σ = 263354664218. Its totient is φ = 263354664216.

The previous prime is 263354664187. The next prime is 263354664271. The reversal of 263354664217 is 712466453362.

Together with next prime (263354664271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224421060361 + 38933603856 = 473731^2 + 197316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263354664217 is a prime.

It is not a weakly prime, because it can be changed into another prime (263354664917) 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, 131677332108 + 131677332109.

It is an arithmetic number, because the mean of its divisors is an integer number (131677332109).

Almost surely, 2^263354664217 is an apocalyptic number.

It is an amenable number.

263354664217 is a deficient number, since it is larger than the sum of its proper divisors (1).

263354664217 is an equidigital number, since it uses as much as digits as its factorization.

263354664217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 49.

The spelling of 263354664217 in words is "two hundred sixty-three billion, three hundred fifty-four million, six hundred sixty-four thousand, two hundred seventeen".