166385305 has 8 divisors (see below), whose sum is σ = 202474944. Its totient is φ = 131233200.

The previous prime is 166385291. The next prime is 166385309. The reversal of 166385305 is 503583661.

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

It is not a de Polignac number, because 166385305 - 2¹¹ = 166383257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166385309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233991 + ... + 234700.

It is an arithmetic number, because the mean of its divisors is an integer number (25309368).

Almost surely, 2^166385305 is an apocalyptic number.

It is an amenable number.

166385305 is a deficient number, since it is larger than the sum of its proper divisors (36089639).

166385305 is an equidigital number, since it uses as much as digits as its factorization.

166385305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468767.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 166385305 is about 12899.0427939441. The cubic root of 166385305 is about 550.0113551375.

It can be divided in two parts, 1663 and 85305, that added together give a palindrome (86968).

The spelling of 166385305 in words is "one hundred sixty-six million, three hundred eighty-five thousand, three hundred five".