166528886917 has 4 divisors (see below), whose sum is σ = 168810104620. Its totient is φ = 164247669216.

The previous prime is 166528886851. The next prime is 166528886957. The reversal of 166528886917 is 719688825661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48801669921 + 117727216996 = 220911^2 + 343114^2 .

It is a cyclic number.

It is not a de Polignac number, because 166528886917 - 2³¹ = 164381403269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166528886957) 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 in 3 ways as a sum of consecutive naturals, for example, 1140608742 + ... + 1140608887.

It is an arithmetic number, because the mean of its divisors is an integer number (42202526155).

Almost surely, 2^166528886917 is an apocalyptic number.

It is an amenable number.

166528886917 is a deficient number, since it is larger than the sum of its proper divisors (2281217703).

166528886917 is an equidigital number, since it uses as much as digits as its factorization.

166528886917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281217702.

The product of its digits is 69672960, while the sum is 67.

The spelling of 166528886917 in words is "one hundred sixty-six billion, five hundred twenty-eight million, eight hundred eighty-six thousand, nine hundred seventeen".