165550666 has 8 divisors (see below), whose sum is σ = 248575140. Its totient is φ = 82692288.

The previous prime is 165550657. The next prime is 165550681. The reversal of 165550666 is 666055561.

165550666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 130988025 + 34562641 = 11445^2 + 5879^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39001 + ... + 43036.

Almost surely, 2^165550666 is an apocalyptic number.

165550666 is a deficient number, since it is larger than the sum of its proper divisors (83024474).

165550666 is a wasteful number, since it uses less digits than its factorization.

165550666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83048.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 165550666 is about 12866.6493695911. The cubic root of 165550666 is about 549.0901386275.

The spelling of 165550666 in words is "one hundred sixty-five million, five hundred fifty thousand, six hundred sixty-six".