168784172786657 has 2 divisors, whose sum is σ = 168784172786658. Its totient is φ = 168784172786656.

The previous prime is 168784172786599. The next prime is 168784172786659. The reversal of 168784172786657 is 756687271487861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167718273470881 + 1065899315776 = 12950609^2 + 1032424^2 .

It is a cyclic number.

It is not a de Polignac number, because 168784172786657 - 2¹⁴ = 168784172770273 is a prime.

Together with 168784172786659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168784172786659) 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, 84392086393328 + 84392086393329.

It is an arithmetic number, because the mean of its divisors is an integer number (84392086393329).

Almost surely, 2^{168784172786657} is an apocalyptic number.

It is an amenable number.

168784172786657 is a deficient number, since it is larger than the sum of its proper divisors (1).

168784172786657 is an equidigital number, since it uses as much as digits as its factorization.

168784172786657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10621255680, while the sum is 83.

The spelling of 168784172786657 in words is "one hundred sixty-eight trillion, seven hundred eighty-four billion, one hundred seventy-two million, seven hundred eighty-six thousand, six hundred fifty-seven".