166616556650305 has 8 divisors (see below), whose sum is σ = 199940358144744. Its totient is φ = 133292918544000.

The previous prime is 166616556650281. The next prime is 166616556650437. The reversal of 166616556650305 is 503056655616661.

It can be written as a sum of positive squares in 4 ways, for example, as 70596763187344 + 96019793462961 = 8402188^2 + 9798969^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166616556650305 - 2¹³ = 166616556642113 is a prime.

It is a super-2 number, since 2×166616556650305² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 38592246 + ... + 42691855.

It is an arithmetic number, because the mean of its divisors is an integer number (24992544768093).

Almost surely, 2^{166616556650305} is an apocalyptic number.

It is an amenable number.

166616556650305 is a deficient number, since it is larger than the sum of its proper divisors (33323801494439).

166616556650305 is an equidigital number, since it uses as much as digits as its factorization.

166616556650305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81694067.

The product of its (nonzero) digits is 87480000, while the sum is 61.

The spelling of 166616556650305 in words is "one hundred sixty-six trillion, six hundred sixteen billion, five hundred fifty-six million, six hundred fifty thousand, three hundred five".