165211664 has 20 divisors (see below), whose sum is σ = 321261804. Its totient is φ = 82305408.

The previous prime is 165211649. The next prime is 165211703. The reversal of 165211664 is 466112561.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 156450064 = 2960^2 + 12508^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165211664.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14207 + ... + 23070.

Almost surely, 2^165211664 is an apocalyptic number.

It is an amenable number.

165211664 is a deficient number, since it is larger than the sum of its proper divisors (156050140).

165211664 is a wasteful number, since it uses less digits than its factorization.

165211664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37562 (or 37556 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 165211664 is about 12853.4689481089. The cubic root of 165211664 is about 548.7150875719.

The spelling of 165211664 in words is "one hundred sixty-five million, two hundred eleven thousand, six hundred sixty-four".