166316225617 has 2 divisors, whose sum is σ = 166316225618. Its totient is φ = 166316225616.

The previous prime is 166316225591. The next prime is 166316225623. The reversal of 166316225617 is 716522613661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154650281536 + 11665944081 = 393256^2 + 108009^2 .

It is a cyclic number.

It is not a de Polignac number, because 166316225617 - 2¹⁹ = 166315701329 is a prime.

It is a super-2 number, since 2×166316225617² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166316225687) 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, 83158112808 + 83158112809.

It is an arithmetic number, because the mean of its divisors is an integer number (83158112809).

Almost surely, 2^166316225617 is an apocalyptic number.

It is an amenable number.

166316225617 is a deficient number, since it is larger than the sum of its proper divisors (1).

166316225617 is an equidigital number, since it uses as much as digits as its factorization.

166316225617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The spelling of 166316225617 in words is "one hundred sixty-six billion, three hundred sixteen million, two hundred twenty-five thousand, six hundred seventeen".