165665516 has 12 divisors (see below), whose sum is σ = 299911920. Its totient is φ = 79976400.

The previous prime is 165665483. The next prime is 165665537. The reversal of 165665516 is 615566561.

165665516 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713960 + ... + 714191.

It is an arithmetic number, because the mean of its divisors is an integer number (24992660).

Almost surely, 2^165665516 is an apocalyptic number.

It is an amenable number.

165665516 is a deficient number, since it is larger than the sum of its proper divisors (134246404).

165665516 is a wasteful number, since it uses less digits than its factorization.

165665516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428184 (or 1428182 counting only the distinct ones).

The product of its digits is 162000, while the sum is 41.

The square root of 165665516 is about 12871.1116846992. Note that the first 3 decimals coincide. The cubic root of 165665516 is about 549.2170855140.

The spelling of 165665516 in words is "one hundred sixty-five million, six hundred sixty-five thousand, five hundred sixteen".