165211665 has 8 divisors (see below), whose sum is σ = 264338688. Its totient is φ = 88112880.

The previous prime is 165211649. The next prime is 165211703. The reversal of 165211665 is 566112561.

165211665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165211665 - 2⁴ = 165211649 is a prime.

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, 5507041 + ... + 5507070.

It is an arithmetic number, because the mean of its divisors is an integer number (33042336).

Almost surely, 2^165211665 is an apocalyptic number.

165211665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165211665 is a deficient number, since it is larger than the sum of its proper divisors (99127023).

165211665 is a wasteful number, since it uses less digits than its factorization.

165211665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11014119.

The product of its digits is 10800, while the sum is 33.

The square root of 165211665 is about 12853.4689870089. The cubic root of 165211665 is about 548.7150886790.

The spelling of 165211665 in words is "one hundred sixty-five million, two hundred eleven thousand, six hundred sixty-five".