165610666 has 16 divisors (see below), whose sum is σ = 270534600. Its totient is φ = 75575808.

The previous prime is 165610663. The next prime is 165610691. The reversal of 165610666 is 666016561.

165610666 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 4 ways, for example, as 112975641 + 52635025 = 10629^2 + 7255^2 .

It is not an unprimeable number, because it can be changed into a prime (165610661) 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, 33471 + ... + 38098.

Almost surely, 2^165610666 is an apocalyptic number.

165610666 is a deficient number, since it is larger than the sum of its proper divisors (104923934).

165610666 is a wasteful number, since it uses less digits than its factorization.

165610666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71673.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 165610666 is about 12868.9807677220. The cubic root of 165610666 is about 549.1564656113.

The spelling of 165610666 in words is "one hundred sixty-five million, six hundred ten thousand, six hundred sixty-six".