166009506 has 16 divisors (see below), whose sum is σ = 357559104. Its totient is φ = 51079824.

The previous prime is 166009477. The next prime is 166009511. The reversal of 166009506 is 605900661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064086 + ... + 1064241.

It is an arithmetic number, because the mean of its divisors is an integer number (22347444).

Almost surely, 2^166009506 is an apocalyptic number.

166009506 is an abundant number, since it is smaller than the sum of its proper divisors (191549598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166009506 is a wasteful number, since it uses less digits than its factorization.

166009506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128345.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 166009506 is about 12884.4676257888. The cubic root of 166009506 is about 549.5969565100.

It can be divided in two parts, 16600 and 9506, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 166009506 in words is "one hundred sixty-six million, nine thousand, five hundred six".