165804666 has 16 divisors (see below), whose sum is σ = 331735584. Its totient is φ = 55247184.

The previous prime is 165804641. The next prime is 165804671. The reversal of 165804666 is 666408561.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27741 + ... + 33183.

It is an arithmetic number, because the mean of its divisors is an integer number (20733474).

Almost surely, 2^165804666 is an apocalyptic number.

165804666 is an abundant number, since it is smaller than the sum of its proper divisors (165930918).

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

165804666 is a wasteful number, since it uses less digits than its factorization.

165804666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10525.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 165804666 is about 12876.5160660794. The cubic root of 165804666 is about 549.3708132824.

The spelling of 165804666 in words is "one hundred sixty-five million, eight hundred four thousand, six hundred sixty-six".