165216566 has 16 divisors (see below), whose sum is σ = 249849600. Its totient is φ = 81936360.

The previous prime is 165216559. The next prime is 165216589. The reversal of 165216566 is 665612561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226895 + ... + 227621.

It is an arithmetic number, because the mean of its divisors is an integer number (15615600).

Almost surely, 2^165216566 is an apocalyptic number.

165216566 is a deficient number, since it is larger than the sum of its proper divisors (84633034).

165216566 is a wasteful number, since it uses less digits than its factorization.

165216566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499.

The product of its digits is 64800, while the sum is 38.

The square root of 165216566 is about 12853.6596345165. The cubic root of 165216566 is about 548.7205144985.

The spelling of 165216566 in words is "one hundred sixty-five million, two hundred sixteen thousand, five hundred sixty-six".