166606605 has 64 divisors (see below), whose sum is σ = 325693440. Its totient is φ = 80136000.

The previous prime is 166606603. The next prime is 166606607. The reversal of 166606605 is 506606661.

It is an interprime number because it is at equal distance from previous prime (166606603) and next prime (166606607).

It is not a de Polignac number, because 166606605 - 2¹ = 166606603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166606605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166606603) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 223864 + ... + 224606.

It is an arithmetic number, because the mean of its divisors is an integer number (5088960).

Almost surely, 2^166606605 is an apocalyptic number.

166606605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166606605 is a deficient number, since it is larger than the sum of its proper divisors (159086835).

166606605 is a wasteful number, since it uses less digits than its factorization.

166606605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 913 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 166606605 is about 12907.6180994016. The cubic root of 166606605 is about 550.2550937887.

The spelling of 166606605 in words is "one hundred sixty-six million, six hundred six thousand, six hundred five".