165005566 has 16 divisors (see below), whose sum is σ = 276596208. Its totient is φ = 73172800.

The previous prime is 165005551. The next prime is 165005627. The reversal of 165005566 is 665500561.

It is a congruent number.

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, 90565 + ... + 92368.

It is an arithmetic number, because the mean of its divisors is an integer number (17287263).

Almost surely, 2^165005566 is an apocalyptic number.

165005566 is a deficient number, since it is larger than the sum of its proper divisors (111590642).

165005566 is a wasteful number, since it uses less digits than its factorization.

165005566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182987.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 165005566 is about 12845.4492330942. The cubic root of 165005566 is about 548.4868225342.

The spelling of 165005566 in words is "one hundred sixty-five million, five thousand, five hundred sixty-six".